Question 20
ProgressionsFind the sum of the first 20 terms of the series 8, 12, 16, ......., 96.
- A.1400
- B.1040
- C.960
- D.920
Show the answer and explanation
Answer: D (920)
Explanation
a = 8, d = 4: S20 = 20/2 × (16 + 19 × 4) = 10 × 92 = 920.
Find the sum of the first 20 terms of the series 8, 12, 16, ......., 96.
Answer: D (920)
a = 8, d = 4: S20 = 20/2 × (16 + 19 × 4) = 10 × 92 = 920.