Answer: n².
- A n
- B n+1
- C n²
- D n(n+1)/2
Correct answer: C. n²
Explanation: Sum of first n odd numbers = n². For n=4: 1+3+5+7 = 16 = 4².
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