Question

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

Answer 1

3x5x7+7 can be written as (3x5x1+1)7.

So this number is divisible by 7.

Composite numbers are those which are divisible by itself and other numbers too.


So the given 3x5x7+7 is a composite number.


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Answer 2

7 (3 x 5 x 1 ) +1

7 x 15 + 1

105 +1

106

2 x 53

since it is a product of  prime no. it is composite no.

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