explain why 7*11*13+13 and7*6*5*4*3*2*1*5 are composite number answer it fast the person that will answer it correctly I will mark he /she as brainlist
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7×11×13+13= (7×11×1) 13= 13 ×78
It has more than two factor. It is composite.
7×6×5×4×3×2×5 +1 = (7×6×1×4×3×2×1)5= 5×1009
It is composite
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