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Ben chooses a random integer between 1 and 50, inclusive, twice (and he may choose the same integer twice).  What is the probability that at least one of the numbers Ben chooses is a multiple of $5$?

 Nov 2, 2021
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Prob that the first one is a multiple of 5 is   1/10 = 0.1

prob that the second one is a multiple of 5 is 1/10 = 0.1

probability that they are both a multiple of 5 is  1/100 = 0.01

Prob that at least one is a multiple of 5 is    0.1+0.1-0.01 = 0.19

 Nov 3, 2021

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