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