1. Examples
1. Find Missing Letter in the sequence ??aba??ba?ab
1. ??, ab, a?, ?b, a?, ab (divide into 2 char
group)
2. ab, ab, ab, ab, ab, ab (Possible missing value
for 2 char group)
Answer : abbab
2. Find Missing Letter in the sequence ?baa?aab?a?a
1. ?ba, a?a, ab?, a?a (divide into 3 char group)
2. aba, aba, aba, aba (Possible missing value for 3
char group)
Answer : abab
3. Find Missing Letter in the sequence ab???b?bbaa?
1. ab???b, ?bbaa? (divide into 6 char group)
2. abbaab, abbaab (Possible missing value for
6 char group)
Answer : baaab
4. Find Missing Letter in the sequence ??babbba?a?b
1. ??babb, ba?a?b (divide into 6 char group)
2. bababb, bababb (Possible missing value for 6 char
group)
Answer : babb
5. Find Missing Letter in the sequence aa?ab??aaa?a
1. aa?ab?, ?aaa?a (divide into 6 char group)
2. aaaaba, aaaaba (Possible missing value for 6 char
group)
Answer : aaab
6. Find Missing Letter in the sequence a?bbc?aab?cca?bbcc
1. a?bbc?, aab?cc, a?bbcc (divide into 6 char group)
2. aabbcc, aabbcc, aabbcc (Possible missing value for
6 char group)
Answer : acba
7. Find Missing Letter in the sequence bc?b?c?b?ccb
1. bc?b, ?c?b, ?ccb (divide into 4 char group)
2. bccb, bccb, bccb (Possible missing value for 4 char
group)
Answer : cbcb
8. Find Missing Letter in the sequence abb?baa?a?bab?aba
1. abb?baa?, a?bab?ab, a (divide into 8 char group)
2. abbabaab, abbabaab, a (Possible missing value for
8 char group)
Answer : abba
9. Find Missing Letter in the sequence ab?bc?c?ba?c
1. ab?, bc?, c?b, a?c (divide into 3 char group)
2. abc, bca, cab, abc (Possible missing value for 3
char group)
Answer : caab
10. Find Missing Letter in the sequence ab?bbc?c?ab?ab?b
1. ab?b, bc?c, ?ab?, ab?b (divide into 4 char group)
2. abcb, bcac, caba, abcb (Possible missing value
for 4 char group)
Answer : cacac
11. Find Missing Letter in the sequence a?bccb?ca?cca?baab?c
1. a?bcc, b?ca?, cca?b, aab?c (divide into 5 char group)
2. aabcc, bbcaa, ccabb, aabcc (Possible missing
value for 5 char group)
Answer : ababc
12. Find Missing Letter in the sequence ab?bcbca?ac?bab
1. ab?bc, bca?a, c?bab (divide into 5 char group)
2. abcbc, bcaca, cabab (Possible missing value for 5 char group)
Answer : cca
13. Find Missing Letter in the sequence a?cacbc?baca??b
1. a?cac, bc?ba, ca??b (divide into 5 char group)
2. abcac, bcaba, cabcb (Possible missing value for 5
char group)
Answer : babc
14. Find Missing Letter in the sequence a?ca?bc?bcc?bca
1. a?ca?, bc?bc, c?bca (divide into 5 char group)
2. abcab, bcabc, cabca (Possible missing value for 5
char group)
Answer : bbaa
15. Find Missing Letter in the sequence ?bbca?bccabac?a?cb
1. ?bbca?, bccaba, c?a?cb (divide into 6 char group)
2. abbcac, bccaba, caabcb (Possible missing value for
6 char group)
Answer : acab
16. Find Missing Letter in the sequence ?bcc?ac?aabb?ab?cc
1. ?bcc?a, c?aabb, ?ab?cc (divide into 6 char group)
2. bbccaa, ccaabb, aabbcc (Possible missing value
for 6 char group)
Answer : bacab
17. Find Missing Letter in the sequence ?acca?ccca?acccc?aaa
1. ?a, cca?, ccca?a, cccc?aaa
2. ca, ccaa, cccaaa, ccccaaaa
Answer : caaa
18. Find Missing Letter in the sequence a?cdaab?cc?daa?bbb?ccddd
1. a?cd, aab?cc?d, aa?bbb?ccddd
2. abcd, aabbccdd, aaabbbcccddd
Answer : bbdac
19. Find Missing Letter in the sequence ?aba?cabc?dcba?b?b?a
Divide into 2 parts. Now first part and reverse of second part are same
1. ?aba?cabc?, dcba?b?b?a
2. aababcabcd, dcbacbabaa
Answer : abdcaa
This material is intended as a summary. Use your textbook for detail explanation.
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