Asked by Anonymous
The 10th term of an Arithmetic Progressions is -27 and the 5th term is -12, what is the 18th term? Find also the sum of its 25 terms.
Answers
Answered by
oobleck
a + 4d = -12
a + 9d = -27
clearly, d = -3, so use that to find a, and then find
T18 = T10 + 8d = -27 - 24 = -51
S25 = 25/2 (2a + 24d) = _____
a + 9d = -27
clearly, d = -3, so use that to find a, and then find
T18 = T10 + 8d = -27 - 24 = -51
S25 = 25/2 (2a + 24d) = _____
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