Given five letters are a b c d and e find the number of ways of selecting at least 3 letters out of ...........

Quantitative Aptitude (CDS) Permutation & Combination

Given five letters are a, b, c,d, and e. find the number of ways of selecting at least 3 letters out of these given letters.?

no. of ways selecting at least 3 = selecting 3 + selecting 4 + selecting 5
= 5?3 + 5C4 + 5C5
=10+5+1=16

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