Question

Is 7 × 5 × 3 × 2 + 3 a composite number? Justify your answer.

Answer 1

7×5×3×2+3
3(7×5×2×1+1)
3(70+1)
3×71
3×71×1
....it has more than 2 factors (1 and itself) thus it is a composite number
...