Asked by wisdom
the 9th term of an A.P is 52 while he 12th term is 70. find the sum of is 20 term
Answers
Answered by
Reiny
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
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
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