Question

From the first ten natural numbers, 343 is divisible by:

• A. 7

Answer 1

The correct option is A 7
Here,
343 is divisible by 7 beacuse divisibility test for 7 states that
2a + 3b + c should be divisible by 7 for any number, 'abc'.
For, 343; a = 3, b = 4 and c = 3
2 x 3 + 3 x 4 + 3 = 6 + 12 + 3 = 21,
Since, 21 is divisible by 7 then, 343 is also divisible by 7.