Question

State the following numbers are prime or composite with justification
(i) 5 × 11 × 13 + 13 (ii) 6 × 5 × 4 × 3 × 2 × 1 + 3 × 2 × 1 (iii) l × 2 × 3 × 4 × 5 + 7 × 11

Answer 1

Dear Student,

$$\begin{gathered} \left(i\right)5\times 11\times 13+13 \\ =728 \\ ItsaCompositeNumber \\ \left(ii\right)6\times 5\times 4\times 3\times 2\times 1+3\times 2\times 1 \\ =726 \\ ItsaCompositeNumber \\ \left(iii\right)1\times 2\times 3\times 4\times 5+7\times 11 \\ =197 \\ ItsaPrimeNumber \end{gathered}$$

Regards