Question

For how many integers $n$ between 1 and 100 is the greatest common divisor of 15 and $n$ equal to 3?

Answer 1

put the latex expression between `\(` and `\)` instead of $

Answer 2

it should be

[100/3] - [100/15]

33 - 6

27

Answer 3

Notice that [100/3] gives you the number of multiples of 3 that are less than 100

subtracting the multiples of 15 from that gives you the answer