Asked by Oluwatobi
Fine 9th term of ap is s2 while the 12th term is 70.fine the sum of its 20 term
Answers
Answered by
oobleck
a+8d = 52
a+11d = 70
3d = 18, so d=6
Now you find a, and then
20/2 (2a+19d)
a+11d = 70
3d = 18, so d=6
Now you find a, and then
20/2 (2a+19d)
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