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Question: how to calculate this combination

Question:how to calculate this combination

ComputerUser 535
June 30 2015
0

if input n = 3 which means total 3 alphabet

if value = 2, expect output

a*b, a*c, b*c

 

if value = 1 expect output

a, b, c

 

if total n = 4, four alphabets

value = 3, expect output

a*b*c, a*b*d, a*c*d, b*c*d

 

value = 2 expect output

a*b, *a*c, a*d, b*c, b*d, c*d
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