Engineering Board Exam Reviewer · Sequences and Series · medium
Find the fifth term of the series whose sum of the first n terms is 3n+2-6.
- 3160
- 1458
- 2348
- 4374
Answer
B. 1458
Solution
a5 = S5-S4 = (37-6)-(36-6) = 36(3-1) = 729(2) = 1458.
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