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18-09-2017
Mathematics

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Let n be an integer from 9 to 38.For how many values of n will be n/5 be prime

Respuesta :

18-09-2017

let p = prime number
n = {9, 10, 11, ... 37, 38}

n/5 = p
n = 5p

first few primes
2,3,5,7,..
times 5
10,15,25,35,..

n can be 4 values to make n/5 = prime number

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