7×6×5×4×3×2×1+7=7(720+1)=7×721Nowcompositenumbersarenumberswhichhasatleastonedivisionotherthan1anditself.
Explain why 7*11*13+13 and 7×6×5×4×3+5 are composite numbers.
Explain why 7×11×13+13 & 7×6×5×4×3×2×1+5 are composite numbers ?