Four numbers are multiplied together. Th...

Four numbers are multiplied together. Then the probability that the product will be divisible by 5 or 10 is a. `369/625` b. `399/625` c. `123/625` d. none of these

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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 a. 2^n//5^n b. 4^n-2^n//5^n c. 4^n//5^n d. none of these

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