Discuss Forum
1. 3 , 12, 30,. 39 are the first five terms of a sequence . Each term after the first is obtained by adding 9 to the term immediately preceding it .which term in the sequence is equal to 3 + (33 -1) 9?
- A. 8 th
- B. 8 th
- C. 8 th
- D. 8 th
Answer: Option D
Explanation:
First, term, = 3
General difference = 12 - 3 = 9
Here, 3 + ( 33 - 1) 9 = 3 + 32 × 9 = 291
nth term = a + ( n - 1) d
291 = 3 + ( n - 1) 9
n - 1 = 32
n = 33
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