Question

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

Answer 1

Explanation:

all the number given in problems are not composite number

The multiplecation of not composite number is composite

Answer 2

Answer:

for prime numbers,

there exist only two factors; 1 and itself

foe composite numbers.

we have factors other than, 1 and itself

so if we can prove,the given number has factors other than ,1 and itself, we can prove number is composite

given,

7×11×13+13

= 13×(7×11 + 1)

therefore ,given number has factors other than 1 and itself

sumilarly,

7×6×5×4×3×2×1+5

= 5×( 7×6×4×3×2×1 +1)

therefore, given number is composite