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If we are given a set for ex.S={1,2,.....25} and now if we want to find subsets T ⊆ S of size 5   than  it is 25C5 or they are 2^ 25C5.

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  1. For T ⊆ S  it will be 25C
  2. For T ⊆ P(S ) it will be 2^25C

Correct me if I am wrong!!

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