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Q.

If any four numbers are selected and they are multiplied, then the probability that the last digit will 1,3,5  or 7  is

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a

4/625

b

8/625

c

16/625

d

None of these

answer is B.

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Detailed Solution

The total number of ways = 63 =216If the second number is i (i > 1 ), then the total numberof favorable ways  =∑i=15 (i−1)(6−i)=20.', Required probability =20216=554
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