1 Probability
If n integers taken at random are multiplied together, then the probability that the last digit of the product is 1, 3, 7 or 9, is
SOLUTION
If the last digit be, 1,3,7, or 9, none of the numbers can be even or end in 0 or 5. Thus we have a choice of 4 digits. i.e, 1, 3, 7, or 9 with each of n numbers should end.
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