Question

please answer this question ​

Answer 1

5 × 11 × 13 + 13

Taking 13 as common

13(5×11+1)

= 13 × 56

Therefore here we can see that an odd number is being multiplied by an even number. We know when an odd number is multiplied by an even number the result is always even. And Non of the even number other than 2 are prime. Therefore Now we can say 5 × 11 × 13 + 13 is a composite number.

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