Question

1. Lxplain why 3x5x7+7x11 is a composte number
2 Explain why 5x7x11 + 13x7 is a composite number
3. why 17+ 11x 13 x14X9 is composite number? Explains 4.check whether 7×6×3×5+5 is a composite number ​

Answer 1

Step-by-step explanation:

1 We have, 3 × 5 × + 7 = 105 + 7 = 112

Now, 112 = 2 × 2 × 2 × 2 × 7 = 24 × 7

So, it is the product of prime factors 2 and 7. i.e., it has more than two factors.

Hence, it is a composite number.

2. Given 7×11×13+13

=13×(7×11+1)=3×78

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

similarly in

7×6×5×4×3 ×2×1+5

=5(7×6×4×3 ×2×1+1)=5×1009

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.