Question

Plz show that 3*5*7+7 be composite number

Answer 1

Answer:

3 × 5 × 7 + 7

= 7 ( 3 × 5 + 1 )

= 7 ( 15 + 1 )

= 7 × 16

Therefore, the number is divisible by 7 and 16 and thus is divisible by 2 numbers other than 1 and the number itself.

So, it is a composite number.

Answer 2

A composite number is a positive integer that can be formed by multiplying two positive smaller integer....

3*5*7+7

=112

[The factor of 112 is 2*2*2*2*7]

So, 112 can be formed by multiplying 16*4