RRB NTPC CBT-1 previous year question
What should come in place of ‘?’ in the given series? 9 ? 18 45 109 234
Asked in RRB NTPC 2026 — 14 June Shift 2 · Reasoning
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Correct answer: (B) 10
The differences between consecutive terms (a3-a2, a4-a3, a5-a4, a6-a5) follow the cubes 23, 33, 43, 53 = 8,27,64,125; working backward, a2 = 18-8 = 10, and a1 to a2's difference 13=1 confirms 9+1=10.
हिंदी में प्रश्न
दी गई श्रृंखला में '?' के स्थान पर क्या आना चाहिए? 9 18 45 109 234
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 10
क्रमागत पदों के बीच अंतर (a3-a2, a4-a3, a5-a4, a6-a5) घनों 23, 33, 43, 53 = 8,27,64,125 का अनुसरण करते हैं; पीछे की ओर काम करने पर, a2 = 18-8 = 10, और a1 से a2 का अंतर 13=1, 9+1=10 की पुष्टि करता है।
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