Question

Check whethee 5×3×11+11 and 13×5×3×2+3 are composite or not

Answer 1

Solution :-

5 × 3 × 11 + 11

= (5 × 3 × 1 + 1)11

= 16 × 11

And 13 × 5 × 3 × 2 + 3

= (13 × 5 × 1 × 2 + 1)3

= 131 × 3

Here, 5 × 3 × 11 + 11 and 13 × 5 × 3 × 2 + 3 have more than two factors. So, it is composite number.