Question

Explain 7*11*13+13 and 7*6*5*4*3*1+5 are composite number

Answer 1

7×11×13 + 13 and 7×6×5×4×3×1 +5 are composition numbers

Composite numbers have multiple factors

here

7×11×13 + 13 = 13 ( 7×11×1 + 1)

7×6×5×4×3×1 + 5 = 5 ( 7×6×4×3×1×1 + 1)

Clearly they have factors like 13 and 5

Therefore the above numbers are composite numbers