Question

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

Answer 1

In 7 *11*13+13

13(7*11+1)

hence it has factors other than 1 and no. itself,so it's a composite number.

In 7*6*5*4*3*2*1+5

5(7*6*4*3*2*1+1)

hence as this also have factors other than 1 and no itself ,so it's a composite number.

Hope it helped

Answer 2

Answer:

Step-by-step explanation:

any number which can be divided by a number other than one or itself is a composite number. now,

7x11x13 + 13 = (7×11 + 1)×13 is divisible by 13. then it is composite.

Similarly,

7x6x5x4x3x2x1 + 5 =

= (7x6x4x3x2x1 + 1)x5 is clearly divisible by 5. thus it is composite.