Question

explain why 3×5×7+5 is a composite number?

Answer 1

Taking 5 common,
5(3×1×7 + 1)

Therefore the factors of 3×5×7+5 are 5,1,3×5×7+5 ,3×1×7+1

Answer 2

→what is composite number?

★ number having more that two factors i.e other than 1 and itself is called a composite number.

for example,

4= 1,2,4

6= 1,2,3,6

the above mentioned numbers have more than two factors ,so they are composite number

→ 3 x 5 x 7 + 5

= 5(3 x 1 x 7 +1)

=5(21+1)

=5(22)

= composite number

( since, the given number has more than two factors)


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