Question

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

Answer 1

1st case

7*11*13+13 = 13(7*11+1) = 13*78 = 13*2*3*13

Since it has more than two prime factors, it is a composite number.

Similarly,

2nd case

7*6*5*4*3*2*1+5 = 5(7*6*4*3*2*1+1) = 5*1009

Since it has more than two prime factors, it is a composite number.

Answer 2

Answer:

BECAUSE THEY HAVE MORE THAN TWO FACTORS

Step-by-step explanation:

A.7×11×13+13

7×11×13(1+1)

SO , SINCE THIS NO. HAS THREE FACTORS IT IS COMPOSIT(NAMELY 7,11,13)

B.7×6×5×4×3×2×1+5

7×6×5(1+1)×4×3×2×1

SINCE THE NO. HAS MORE THAN TWO FACTORS IT IS COMPOSITE. (FACTORS=> 7,6,5,4,3,2,1)

HOPE YOU GOT YOUR ANSWER .