Question

Amy has $7$ balls and Jack has $8$ balls. Which of the following options is correct?

• A. Amy has an odd number of balls.
• B. None of the above.
• C. Both a and b
• D. Jack has an even number of balls.

Answer 1

The correct option is C Both a and b

Amy has $7$ balls.

When we group $7$ balls in pairs, we can observe that one ball gets left out.
We cannot group all $7$ balls in pairs.
So, Amy has an odd number of balls.

Jack has $8$ balls.

We can group all $8$ balls in pairs.
So, Jack has an even number of balls.