Answer: a + (n-1)d.
- A a + nd
- B a + (n+1)d
- C a + (n-1)d
- D n × a
Correct answer: C. a + (n-1)d
Explanation: nth term of AP: an = a + (n-1)d, where a is first term and d is common difference.
Bar heights for AP 2, 5, 8, 11 with the common difference d=3 marked between consecutive terms.
Concept context
Arithmetic progressions, geometric progressions, and sums