Select the number that can replace the question mark (?) in the following series.3, 4, 10, 33, 136, ?

A. 690

B. 685

C. 680

D. 816

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cgl Save WhatsApp Report

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Best answer

Answer: B. 685

Answer: (B) 685

Rule: ×1 + 1, ×2 + 2, ×3 + 3, ×4 + 4, ...

3×1+1 = 4, 4×2+2 = 10, 10×3+3 = 33, 33×4+4 = 136.

Next: 136 × 5 + 5 = 685.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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