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Q.

From a collection of eight cards numbered 1 to 8.If two cards are drawn at random, one after the other with replacement, then the probability that the product of numbers that appear on the cards is a perfect square is

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a

116

b

316

c

613

d

314

answer is C.

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Detailed Solution

Card numbers=1,2,3,4,5,6,7,8

ns=64

nE=1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,1,4,4,1,2,8,8,2

nE=12

PE=nEnS=316

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