NPR=720,CNR=120find r
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n!/(n-r)!=720. --------(1)
n!/(n-r)!r!=120. --------------(2)
divide equation (1) and (2)
r!=6
hence r=3
n!/(n-r)!r!=120. --------------(2)
divide equation (1) and (2)
r!=6
hence r=3
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