Question

4. The total numbers from 1 to 400 which are
divisible either by 3 or by 7 are​

Answer 1

Answer:

So there are 19 of them. If you mean divisible by 3 or 7, then we are looking to add the number of multiples of 3 and multiples of 7 and then subtracting the multiples of both (so we do not count them twice). Smallest multiple of 3 is 3 = 1 x 3. Largest multiple of 3 is 399 = 133 x 3.