Amy has 7 balls and Jack has 8 balls. Which of the following options is correct?
A
Amy has an odd number of balls.
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B
None of the above.
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C
Both a and b
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D
Jack has an even number of balls.
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Solution
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.