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Two finite sets A and B having m and n elements. The total number of relation from A to B is 64, then possible values of m and n are 

(a) 2 and 4           (b) 2 and 3 

(c) 2 and 1           (d) 64 and 1

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Correct option is (b)

Explanation :

2mn = 64 ⇒ mn = 6

∴ The possible value of m and n are 2 and 3.

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