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Find Combinations with repetition of {a, b, c, d}

Solution:
Your problem `->` Combinations with repetition of {a, b, c, d}


`n=4,r=4,"List variables"=a, b, c, d`

Combination with repetition :
Formula ` = ((n+r-1)!) / (r! (n-1)!) = ((4+4-1)!) / (4! * (4-1)!)= (7!) / (4! * 3!) = 35`

List are (total = 35) :
{a,a,a,a}, {a,a,a, b}, {a,a,a, c}, {a,a,a, d}, {a,a, b, b}, {a,a, b, c}, {a,a, b, d}, {a,a, c, c}, {a,a, c, d}, {a,a, d, d}, {a, b, b, b}, {a, b, b, c}, {a, b, b, d}, {a, b, c, c}, {a, b, c, d}, {a, b, d, d}, {a, c, c, c}, {a, c, c, d}, {a, c, d, d}, {a, d, d, d}, { b, b, b, b}, { b, b, b, c}, { b, b, b, d}, { b, b, c, c}, { b, b, c, d}, { b, b, d, d}, { b, c, c, c}, { b, c, c, d}, { b, c, d, d}, { b, d, d, d}, { c, c, c, c}, { c, c, c, d}, { c, c, d, d}, { c, d, d, d}, { d, d, d, d}





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