Question:
If the sum of the first 2n terms of 2, 5, 8, … is equal to the sum of the first n terms of 57, 59, 61, …, then n is equal to:
If the sum of the first 2n terms of 2, 5, 8, … is equal to the sum of the first n terms of 57, 59, 61, …, then n is equal to:
Show Hint
Always reduce AP sum equations to linear form.
Updated On: Mar 18, 2026
- 10
- 12
- 11
- 13
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The Correct Option is C
Solution and Explanation
Step 1: Use AP sum formula. S₂ₙ = n(2a+(2n-1)d)
Step 2: Equating sums. Solve linear equation to get n=11.
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