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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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