Question

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

Answer 1

Answer:

Very imp 1 mark Question in 10th.

Understand it this way that composite numbers are those which have more than two factors ( one and itself)

hence apart from all the primes rest are all composite numbers.

so to prove this

given, 7x11x13+13

taking 13 common

= 13(7x11+1)

= 13(77+1)

= 13(78)

See here it's the main thing to understand that the number is been now written in product of two different numbers which shayd that it have 13 and 78 are also factors which means it has more than 2 factors so it's composite.

it's easy just practice.

Thanks and Like.

Teacher.

Answer 2

Step-by-step explanation:

7×6×5×4×3×2×1 +5 are composite numbers.