Asked by Bello Timothy

The 10th and 10th terms of an Ap is -27 and -12, what is the 18th term, find the sum of its 25 terms

Answers

Answered by oobleck
The 10th and 10th terms ... ???
after you fix your typo and solve for a and d, then
a_18 = a+17d
S25 = 25/2 (2a + 24d)
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