Question

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

Answer 1

Step-by-step explanation:

(i)7×11×13+13

(7×11+1)×13

(77+1)×13

78×13

LCM of 78

=2×3×13×13

=2×3×13^2

(ii)7×6×5×4×3×2×1+5

(7×6×4×3×2×1+1)×5

(1008+1)×5

(1009)×5

Answer 2

Answer: it is composite number

Step-by-step explanation:

Because, 7*11*13+13 =>7*11*13 *2

7*6*5*4*3*2*1+5=>7*6*5*2*4*3*2*1

Therefore, Composite number is multiple of prime number