Question

if 7x5x3x2+3 is composite number.justify/?

Answer 1

Let a = 7*5*2 
7*5*3*2 + 3 
= 3a + 3 
= 3(a + 1) 
Yes, it is a composite number, since it is divisible by 3.

Answer 2

7*5*3*2+3
3(7*5*2+1)
3*71
As this no. has factors other than 1 and no. itself,it is a composite number.