Question

explain that 7×11×13+13 is a composite number​

Answer 1

13(7*11+1)

13(78)

1014

it is a composite number because the end or unit digit is 4 and it's composite so that's why we can say that it is composite number.

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Answer 2

13 ( 7 × 11 + 1)

= 13 × 78

as the number have 13 and 78 as factors other than 1.

so it is a composite number