Question

Explain why 7*11*13+13and7*6*5*4*3*2*1+5 are composite number​

Answer 1

Answer:

7×11×13+13 may be written as, i.e. 13 * (78). So other than 1 and the number itself, 13 and 78 are also the factors of the number. ... So, other than the number and 1, it have 5 and 1009 as it's factors too. So it is also a composite number