Question

Explain Why 3*5*7+7 is a composite no.

Answer 1

$\huge{\underline{\underline{\red{Answer}}}}$

$3 \times 5 \times 7 + 7 \\ = 7 \times (3 \times 5 + 1) \\ = 7 \times (15 + 1) \\ = 7 \times 16$

As the given number has factor other than 1 and itself thus the number is a composite number.

━━━━━━━━━━━━━━━

$\underline{\boxed{\pink{Knowledge\:Cell}}}$

▪What is a composite number?

》Any number that has a factor other than one and itself is known as composite number.

Ex- 4,6,8,9.... etc

▪What is a prime number?

》Any number that has one and itself as its only factor is called a prime number.

Ex-2,3,5,7....etc

Answer 2

Answer:

3*5*7+7

= 105+7

=112

since 112 has more than 2 factors it's a composite number.

factors of 112

= 1,2,4,7,8 etc

Step-by-step explanation:

hope it helps you