a+8d = 52
a+11d = 70
subtract them
3d = 18
d = 6
back into the first:
a + 48 = 52
a = 4
term20 = a+19d
4 + 19(6) = 118
the 9th term of an A.P is 52 while he 12th term is 70. find the sum of is 20 term
1 answer
1 answer
2 answers
2 answers
1 answer
1 answer