Question

Explain why:
(i) 7 × 11 × 13 × 15 + 15 is a composite number
(ii) 11 × 13 × 17 + 17 is a composite number.
(iii) 1 × 2 × 3 × 5 × 7 + 3 × 7 is a composite number.

Answer 1

Answer:

1) 7

$1) 7 \times 11 \times 13 \times 15 + 15 = 15030|$

$2) 11 \times 1 3 \times 17 + 17 = 2448$

$3) 1 \times 2 \times 3 \times 5 \times 7 + 3 \times 7 = 231$

Answer 2

answer

(I) is a composite number =15030 is divisible in 1 table, 5 table ,3 table

(ii) is a composite number =2448 is divisible in 1 table, 2 table, 8 table

(iii) is not a composite number =231 is divisible by only in 1 table, and 11 table only