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Explain why 7×11×13 and 7×6×5×4×3×2×1+5 are …

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Explain why 7×11×13 and 7×6×5×4×3×2×1+5 are composite number?

    • Posted by Shruti Singh 5 years, 5 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 5 months ago

    Given 7×11×13+13

    =13×(7×11+1)=3×78 

    This number is multiple of two integers. Hence it has more than two factors. Hence it is a composite number.

    similarly in

    7×6×5×4×3 ×2×1+5   

    =5(7×6×4×3 ×2×1+1)=5×1009   

    This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

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