Asked by felix
The third and fifth terms of arithmetic progression are 10 and-10 respectfully. Determine the first and the common difference
Answers
Answered by
oobleck
a1 is as far from a3 as a5 is, so a1 = 30
2d = -10-10 = -20
d = -10
2d = -10-10 = -20
d = -10
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