Please help

Asked by Rahulsinha1993 | 5th Nov, 2009, 10:52: AM

Expert Answer:

since out of n things p things must always be a part of the selection, so

basically we need to select out of n-p things.since we have to select total r things, and out of which p are already selected, so r-p things are left to be selected.

 hence the answer.

 

Answered by  | 7th Nov, 2009, 09:53: PM

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