Question

between 1 to 200 how much numbers are divisible by 3 but not buy 7​

Answer 1

there are 66 numbers which are divisible by 3 and 28 are divisible by 7

Answer 2

hey

a = 3

an = 198

d = 3

an = a + (n-1)d

198 = 3 + (n-1)3

195/3 = n-1

65 = n - 1

n = 65 + 1

n = 66

66 numbers are divisible by 3 in between 1 and 200