Question

What is the number of integers that are not divisible by 7 in the range of integers from 3 to 500?

Answer 1

number that are divisible by 7 be n

$a_{n} = a +{ {n - 1}} \div d$

497=7+(n-1)(7)

490=(n-1)(7)

n-1=70

n=71

integer that are not divisible by 7 b/w 3 and 500 are

498-71=427

Answer 2

426 is the number of integers which not divided by 7 in between 3to500 ex(8,9,10,11,12,13,15 and etc)

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