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Sequences & Series
JEE Mathematics • 10 questions • Free on ExamBattle
Practice Questions
Q1
The sum of first n natural numbers is:
- A. n(n+1)/2
- B. n²
- C. n(n+1)(2n+1)/6
- D. [n(n+1)/2]²
Q2
If a, b, c are in AP, then 2b equals:
- A. a + c
- B. a - c
- C. ac
- D. a/c
Q3
The nth term of GP (a, ar, ar², ...) is:
- A. arⁿ
- B. arⁿ⁻¹
- C. arⁿ⁺¹
- D. a + nr
Q4
The sum of infinite GP with first term a and common ratio r (|r| < 1) is:
- A. a/(1-r)
- B. a/(1+r)
- C. ar
- D. a(1-r)
Q5
The sum of squares of first n natural numbers is:
- A. n(n+1)/2
- B. n(n+1)(2n+1)/6
- C. [n(n+1)/2]²
- D. n²(n+1)²/4
Q6
If first term = 2 and common difference = 3, then the 5th term is:
- A. 14
- B. 15
- C. 11
- D. 12
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