Question

How many numbers less than 904 are divisible by 3?

Answer 1

$\Rightarrow T(n) = a + (n - 1)d$

$\Rightarrow 903 = 3 + (n - 1)3$

$\Rightarrow 903 = 3 + 3n - 3$

$\Rightarrow 3n = 903$

$\Rightarrow n = 301$

$A: 301$