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Educational Level Secondary school, High school and College
Program Purpose Provide step by step solutions of your problems using online calculators (online solvers)
Problem Source Your textbook, etc

1. Hyperbolic functions implemented on 26.09.19
2. Five number summary
3. diagonally dominant matrix
4. diagonally dominant equation
5. set builder notation (Code improved) on 19.09.19
6. stem and leaf plot
7. Partial Fraction bug solved on 13.09.19
8. PERT and CPM Network diagram (improved) on 26.08.19
9. BCD and Excess 3 Addition and Subtraction using 9's or 10's complement Method on 22.08.19
1. BCD Addition
2. BCD Subtraction using 9's complement
3. BCD Subtraction using 10's complement
4. Excess 3 Addition
5. Excess 3 Subtraction using 9's complement
6. Excess 3 Subtraction using 10's complement
10. Conversion on 22.08.19
1. Decimal To BCD
2. Binary To BCD
3. Octal To BCD
4. Hexadecimal To BCD

5. BCD To Decimal
6. BCD To Binary
7. BCD To Octal
8. BCD To Hexadecimal
9. BCD To Excess 3

10. Decimal To Excess 3
11. Binary To Excess 3
12. Octal To Excess 3
13. Hexadecimal To Excess 3

14. Excess 3 To Decimal
15. Excess 3 To Binary
16. Excess 3 To Octal
17. Excess 3 To Hexadecimal
18. Excess 3 To BCD

19. Decimal To Gray code
20. Binary To Gray code
21. Octal To Gray code
22. Hexadecimal To Gray code

23. Gray code To Decimal
24. Gray code To Binary
25. Gray code To Octal
26. Gray code To Hexadecimal
11. Logarithmic equations 07.08.19
Unitary Method 18.07.19
12. If 17 books cost Rs 306, what do 29 books cost?

13. If 5 artical cost Rs 90, the cost of 9 artical is?

14. If 20 persons can do a piece of work in 7 days, then the number of persons required to complete the work in 28 days is?

15. If 5 men working 6 hours a day can reap a field in 20 days, in how many days will 15 men reap the field, working 8 hours a day?
Probability 17.07.19
16. 3 unbiased coins are tossed, What is the probability of getting exactly 2 tails

17. In a throw of two dice, What is the probability getting a total of 10 or 11

18. two card is drawn at random from a pack of 52 cards. What is the probability that the drawn cards are both aces

19. A bag contains 5 blue and 4 black balls. Three balls are drawn at random, what is the probability that 2 are blue and 1 is black?
Problem on Ages 16.07.19
20. 10 years ago, A was 4 times as old as B. 10 years hence, A will be 2 times as old as B. At present, A's age and B's age is ?

21. The ratio of Meena's age and Kamla's age is 3 : 5 and the sum of Meena's age and Kamla's ages is 80 years. The ratio of their ages after 10 years will be ?
Quadratic equations (Solution by considering m) on 10.07.19
22. `(x^2+1/x^2)-8(x+1/x)+14=0`
23. `4((4x+1)/(4x-1))^(2)+(4x+1)/(4x-1)=3`
24. `12((x)/(x-1))+12((x-1)/(x))=25`
25. Vector Algebra on 08.07.19
1. Addition/Subtraction of two vectors
2. Scalar Multiplication of vectors
3. Dot Product of two vectors
4. Cross Product of two vectors
5. Magnitude(length) of a vector
6. Unit vector
7. Direction cosines of a vector
8. Component form of a vector given two points
9. Angle between two vectors
10. Vector projections of B onto A
11. Orthogonal vectors
12. Collinear vectors
13. Coplanar vectors
14. Scalar triple product
15. Area of triangle determined by two vectors
16. Area of parallelogram determined by two vectors
17. Volume of pyramid determined by vectors
18. Volume of Parallelepiped determined by vectors
19. Decomposition of vector in basis
20. Linearly dependent and linearly independent vectors
26. Normal Distribution Table
27. t Distribution Table
28. Chi square Distribution Table
29. F Distribution Table
30. Binomial Distribution Table

31. F test
32. t test
33. Standard error
34. Sign test
35. Mann whitney U test
36. Kruskal wallis test
37. Chi square test
38. Median test
39. Mood's Median test
40. Cholesky decomposition method of a System of linear equations on 06.06.19
41. Covariance - Population cov(x,y), Sample cov(x,y) for X & Y or Class-X & Y on 03.06.19

42. Covariance - Population cov(x,y), Sample cov(x,y) for bivariate grouped data on 03.06.19
43. LU decomposition method / Crout's method of a System of linear equations on 30.05.19
44. Mean, Quartile, Decile, Percentile deviation for ungrouped data on 19.05.19
45. Mean, Quartile, Decile, Percentile deviation for grouped data on 19.05.19

46. One-way ANOVA on 09.05.19
47. Two-way ANOVA on 09.05.19

48. Power Method for dominant eigenvalue on 28.04.19

49. Partial Fraction on 19.04.19

50. Find roots of non-linear equations using Multivariate Newton Raphson method on 19.04.19

51. Solve linear equations using Elimination method on 19.04.19
52. Maximize Profit case in transportation problem on 07.04.19

53. Revised Simplex method on 26.03.19

54. Moore-Penrose Pseudoinverse on 22.03.19

55. Geometric mean, Harmonic mean for ungrouped data on 21.03.19
56. Geometric mean, Harmonic mean for grouped data on 21.03.19
57. LQ Decomposition on 20.03.19
58. Muller method on 20.03.19
59. Matrix Algebra on 17.03.19
1. Matrix Algebra with variables `[[2x,3y],[3x,4z]]`
2. Matrix Algebra with complex numbers `[[-5i,3i],[4i,5i]]`
3. Matrix Algebra with surds `[[1/sqrt(2),sqrt(2)],[4,-5]]`
60. PERT and CPM on 10.03.19
1. Network diagram
1. Activity, Predecessors
2. Activity i-j
3. Activity i-j, Name of Activity

2. Critical path, Total float, Free float, Independent float
1. Activity, Predecessors, Duration
2. Activity i-j, Duration
3. Activity i-j, Name of Activity, Duration

3. Project scheduling with uncertain activity times (Optimistic, Most likely, Pessimistic)
1. Activity, Predecessors, to, tm, tp
2. Activity i-j, to, tm, tp
3. Activity i-j, Name of Activity, to, tm, tp

4. Project crashing to solve Time-Cost Trade-Off with fixed Indirect cost
1. Activity, Predecessors, Normal Time & Cost, Crash Time & Cost and Indirect Cost
2. Activity i-j, Normal Time & Cost, Crash Time & Cost and Indirect Cost
3. Activity i-j, Name of Activity, Normal Time & Cost, Crash Time & Cost and Indirect Cost

5. Project crashing to solve Time-Cost Trade-Off with varying Indirect cost
1. Activity, Predecessors, Normal Time & Cost, Crash Time & Cost and varying Indirect Cost
2. Activity i-j, Normal Time & Cost, Crash Time & Cost and varying Indirect Cost
3. Activity i-j, Name of Activity, Normal Time & Cost, Crash Time & Cost and varying Indirect Cost
61. Transportation Problem
1. Heuristic method-1 on 07.01.19
2. Heuristic method-2 on 07.01.19
3. Row minima method on 24.12.18
4. Column minima method on 24.12.18
5. Russell's approximation method on 24.12.18


62. class and their frequency table on 31.12.18
63. less than or more than type cumulative frequency table on 31.12.18


64. Ratio and Proportion on 02.12.18

65. Synthetic division on 12.11.18

66. Singular Value Decomposition (SVD) on 04.11.18

67. All problem solution using search box on 05.10.18
68. Share solution on facebook, twitter with your friends on 17.08.18
69. Matrix Structure on 24.07.18
70. Algorithm, Formulas, Examples added at respective pages on 20.07.18
71. Simplex method Algorithm and examples on 08.07.18
72. Statistical Methods on 30.03.18
1. Permutation & combination
1. Find `n!`
2. Find `(n!)/(m!)`
3. Find `{::}^nP_r`
4. Find `{::}^nC_r`
5. How many words can be formed from the letters of the word daughter?
6. How many ways a committee of players can be formed ?
7. Permutation, Combination List

2. Probability
1. Coin
2. Dice
3. Cards
4. Balls
73. Calculus
1. Trigonometry on 20.03.18
1. Simplifying trigonometric equations, proving identities, eg. (1) `sin(30)*cos(60)+sin(30)*cos(60)`, (2) `tan(x)+cot(x)`, (3) `tan^2(x)-sin^2(x)`, (4) `csc(x)/cos(x)-cos(x)/sin(x)`
2.1 If `sin(x)=5/13` then Find the value of all the other five trigonometric functions
2.2 If `sin(x)=3/5` then solve expression `cos(x)csc(x)+tan(x)sec(x)`

2. Derivative on 20.03.18
1. Find Derivative, eg. (1) `d/(dx)(2x^(3)-2x^(2)-5x+4)`, (2) `d/(dx)(log(x)e^(x))`, (3) `d/(dx)(3cos(sin(x)))`
2. Find maximum and minimum value of `y=x^3+6x^2-15x+7`
74. About us

75. Algebra
1. Functions
2. Set Theory (using builder form)
3. Interval notation and set builder notation

76. Word Problems
1. Problem on Ages
2. Unitary Method

77. Simplex method
1. Branch and Bound method
2. 0-1 Integer programming problem

78. Game Theory
1. Bimatrix method

79. Matrix operations
1. Cholesky Decomposition
2. QR Decomposition (Gram Schmidt Method)
3. QR Decomposition (Householder Method)

80. Solve numerical differential equation using
1. Adams bashforth predictor method
2. Milne's simpson predictor corrector method

81. Coordinate Geometry

 


 
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