a. common difference = 4 ... number of terms = 25
... sum = [(101 + 5) / 2] * 25
b. common difference = -3 ... number of terms = 27
find the sum of the following series
a. 5, 9, 13, ..., 101
and
c. 83, 80, 77, ..., 5
thank you!!
1 answer