Sagot :
Answer:
12. The set of first seven natural numbers - { 1,2,3,4,5,6,7}
13. The set of letters in the word "examination" - {e,x,a,m,i,n,a,t,i,o,n}
15. The set of first five counting numbers each of which is divisible by 7
{7, 14, 21, 28, 35}
Explanation: yung number 14 di ko po alam sorry hehe