Question

explain why
$3 \times 5 \times 7 + 7 \times 1$
is composite number
​

Answer 1

the number is composite number because it has factors other than 1 and the number itself

Answer 2

Step-by-step explanation:

3x5x7+7x1

this can be written as 7(3x5x1)+1(taking 7 common)

so it becomes 7 x 15+1= 7x16

if any no. is not composite means it is prime and if a no. is prime then it has factors as only 1 and the no. itself but here we can see that the number has factors 7 and 16 other than 1 and the no. itself, so the no. is not prime, thus the no. composite