Question

How many positive integers less than 400 are multiples of 3?

Answer 1

Answer:

14 numbers less than 400.

n is divided by 4, the remainder is 3 and when n is divided by 7, the remainder is 1

The numbers would be 15, 43, 71,Its an AP with difference as 28. -> 15 + (n-1)*28

Among the options, if there are 13 numbers, the 13th number would be

15 + 12*28 = 351.

The 14th number would be 15 + 13*28 = 379.

15th no = 407

14 numbers less than 400.

Answer 2

Answer:

400 / 3 = 133 (approx.). there is 133 positive integers less than 400 multiple of 3