Question

4. Explain why 7 x 11 x 13+ 13 and 7 x 6 x 5 x 4 x 3 x 2 x 1 + 5 are composite
numbers.​

Answer 1

Answer:

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.

Answer 2

Answer:

hm...

7×11×13+13=

77×26=2002

2002 is also divisible by 2

this means it's a composite number

composite numbers are those numbers which have factors other than 1 and itself..

7×6×5×4×3×2×1+5..

5040

it's also divisible by 2 and 5 it's a composite number...

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