Permutations and Combinations 2 Question 16

16. Let A be a set of n distinct elements. Then, the total number of distinct functions from A to A is… and out of these… are onto functions.

(1985,2M)

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Answer:

Correct Answer: 16. nn,r=1n(1)nrCr(r)n

Solution:

  1. Let A=x1,x2,,xn

Number of functions from A to A is nn and out of these r=1n(1)nrnCr(r)n are onto functions.



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