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Question

Explain why 5*3*7+7is a composite number.

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Solution

A composite number is a number that is divisible by another number other than by itself and one. The number 2 is the only even prime number. All other even numbers are composite numbers.

As per BODMAS rule:

3 x 5 x 7 + 7 = 105 + 7 = 112.

112 is an even number and is therefore a composite number.

Also, 112 is divisible by other numbers such as 2, 4, 7, 8, 14, 16, 28 and 56 apart from itself (112) and 1.

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