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find the sum of the following series

a. 5, 9, 13, ..., 101
and
c. 83, 80, 77, ..., 5

thank you!!

1 answer

a. common difference = 4 ... number of terms = 25
... sum = [(101 + 5) / 2] * 25

b. common difference = -3 ... number of terms = 27
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