Explain why 3 × 5 × 7 + 7 is a composite number
Solution:
A composite number is a number that is divisible by another number other than by itself and one. The number 2 is the only even prime number. All other even numbers are composite numbers.
As per BODMAS rule:
3 × 5 × 7 + 7
= 105 + 7
= 112.
112 is an even number.
Therefore,112 is a composite number
✦ Try This: Explain why 7 × 11 × 13 + 13 is a composite number
A composite number is a number that is divisible by another number other than by itself and one. The number 2 is the only even prime number. All other even numbers are composite numbers.
It is given that
7 × 11 × 13 + 13
Taking out 7 as common
= 13(77 + 1)
= 1014
So the factors are 13 × 13 × 3 × 2
Therefore, 1014 is a composite number
☛ Also Check: NCERT Solutions for Class 10 Maths Chapter 1
NCERT Exemplar Class 10 Maths Exercise 1.2 Problem 7
Explain why 3 × 5 × 7 + 7 is a composite number
Summary:
A composite number is a number that is divisible by another number other than by itself and one. So 112 is a composite number
☛ Related Questions:
visual curriculum