A function is defined by mapping f : A → B such that A contains m e – McqOptions

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1.	A function is defined by mapping f : A → B such that A contains m elements and B contains n elements and 1≤n≤m then number of onto functions are ________
A.	r=1∑r=n nCr (-1)n-r rm
B.	r=1∑r=n nCr (-1)n-r rn
C.	r=1∑r=n nCr (-1)m-r rn
D.	None of the mentioned
Answer» B. r=1∑r=n nCr (-1)n-r rn

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