Question

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

Answer 1

Step-by-step explanation:

in 7*11*13+13,

let's take 13 common and this becomes

13(7*11+1)

this becomes composite bcse it has another factor besides 1 and itself

in 7*6*5*4*3*2*1+5,

let's take 5 common and this becomes

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

similar to the first this too becomes composite bcse it has another factor besides itself and 1