Question

Show that (11 x 13 x 15 x 17 + 13) is a composite number.

Answer 1

We see the no. Formed multiplying 11,13,15,17 forms a composite no. Now if we add 13 to a no. Which is already a multiple of 13 the no. Is a composite number
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Answer 2

Answer:

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when any number has more the one factor it is known as composite number. 11 x 13 x 15 x 17 +13 is having 4 factors . therefore it is a composite number.

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