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Solve this ch name is real number (10th class)question- explain why 7 ×11 ×13 + 13 and 7 × 6 ×5 × 4 × 3×2×1+5 are composite numbers.

Answer» HEYA!!
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✔Composite Number : A number that has more than TWO factors is called a composite number . 4 is the smallest composite number .

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⭐ 7×11×13+13

TAKING 13 common ,

13 ( 7 × 11 + 1 )

13 ( 19 )

Hence the number has two factors leading 1 and the number itself . Hence it is a composite number.

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⭐ 7×6×5×4×3×2×1+5

Taking 5 common

5 ( 7×6×4×3×2+1 )

5 ( 42× 24 + 1 )

5 ( 1008+1)

5 (1009)

Hence it has two factors LEAVING 1 and the number itself . Hence it is a composite number .
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