Question 39
ProgressionsFind the nth term of the sequence 5, 10, 20, 40, 80, …
- A.5 × 2n+1
- B.2 × 5n+1
- C.5 × 2n−1
- D.5 × 5n−1
Show the answer and explanation
Answer: C (5 × 2n−1)
Explanation
It is a GP with first term 5 and common ratio 2, so Tn = 5 × 2n−1.