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A five-digit number is chosen at random from all possible five-digit numbers. Find the probability that the number is NOT divisible by every element of ( 1,2,3,4,5 ) 

 Oct 16, 2020
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Between 10,000 and 99,999, there are 90,000 five-digit integers. Out of that 90,000 there are exactly 24,000 integers that are NOT divisible by any number in the set of {1, 2, 3, 4, 5}, with the exception, of course, of being divisible by 1.

Therefore, the probability is: 24,000 / 90,000 = 4 / 15

 
 Oct 16, 2020

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