The first and last terms of an a.p are 79 and 5 and it's sum is 814 find(a) the number of terms in the a.p(b)the common different between them.(c) the 9th terms is of an a.p is 52, while the 12th terms is 70 find the sum of it's 20th terms.
2 answers
What is your school subject? It's not the name of your school.
N (a+l)
/2. A=814,814/2,(79+_5),814/2,84/1=730 or9.6
/2. A=814,814/2,(79+_5),814/2,84/1=730 or9.6