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Explain why 7×11×13+13 and7×6×5×4×3×2×1+5

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Explain why 7×11×13+13 and7×6×5×4×3×2×1+5

    • Posted by Shagun Kansal 6 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Madan M 6 years, 4 months ago

    a))Take 13 as common in 7×11×13+13 =13(7×11+1) =13×78 =13×13×6 So it has more than 2 factor so it is a composite number. b))Take 5 as common in 7×6×5×4×3×2×1+5 =5(7×6×4×3×2+1+1) =5(1008+1) =5×1009 Therefor it has more than 2 factor . so it is a composite number.

    1Thank You

    Uttam Diwvedi 6 years, 4 months ago

    Firstly take 13 common and second 5 solve their equation

    0Thank You

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