Question

If two numbers, both of which are not divisible by 7, are added, then their sum

A is always divisible by 7.

B is never divisible by 7.

C may or may not be divisible by 7.

Answer 1

Answer: C.

Their sum may or may not be divisible by 7

Step-by-step explanation:

For instance, to show that the condition is satisfied..

using:

1 + 6 =7

Note that 1 is not divisible by 7, and 6 is not also divisible by 7.

But their sum which is 7 is divisible by 7.

Also, 2+5 =7, 3+4 =7.. E.t.c

To show that the condition is not satisfied...

Using:

2 + 6 = 8

Note that 2 is not divisible by 7, and 6 is not divisible by 7. Also their sum 8 is not also divisible by 7

Other examples are:

3+ 2 =5

6+9 = 15 e.t.c