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MadeEasy Test Series: Programming & DS - Programming

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What is  mCn?

No of ways of selecting n elements out of m.

Now look at the expression.

Func( m-1, n).  It says...I didn't select that element and now m looking for n elements out of m-1.

Function(m-1,n-1). It says...I selected that element and now I am looking for n-1 more elements out of remaining m-1.

An element can be selected or rejected. Both cases covered.

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