Question

how many numbers are divisible by 3 from 1 to 400​

Answer 1

Answer:

133

Step-by-step explanation:

from 1 to 400 the numbers that can be divisible by 3 = 3,6,9,12,15..........399

Hence,      first term, a = 3

common difference, d = 3                       ; last term = L = 399

let the n numbers are divisible by 3

∴   a+(n-1)d = L

or, 3+(n-1)3 = 399

or,  (n-1)3    = 396

or,    (n-1)    = 132

or,      n      = 132+1 = 133