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