Question

explain why 7×11×13+13 and 7×6×5×4×3×2×1+5​

Answer 1

Answer:

7x11x13+13=77x13+13

=1001+13

1014

7x6x5x4x3x2x1+5

=5040+5=5045

Answer 2

Step-by-step explanation:

Because,when we take 13 common from 7×11×13+13

=13(7×11+1)

=13(77+1)

=13×78

This can be written as

=13×2×3×39

so,we know that for every composite number we can write in product of primes

Hence,7×11×13+13 is a composite number

Now,same 2nd sum also

take 5 common

=5(7×6×4×3×2×1+1)

=5(1009)

=product of primes

Hence,7£×6×5×4×3×2×1+5 is also a composite number