Explain why 7x11x13+13 and 7x6x5x4x3x2x1+5 are
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7x11x13+13 = 13(7x11+1)
factors are 13 and (7 x 11+1)
thus, 7x11x13+13 is composite
similarly,
7x6x5x4x3x2x1+5 = 5(7x6x4x3x2+1)
factors are 5 and (7x6x4x3x2+1)
thus, 7x6x5x4x3x2x1+5 is composite
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7x11x13+13 and 7x6x5x4x3x2x1+5are composite number
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