RRB NTPC CBT-1 previous year question
What should come in place of ‘?’ in the given series? 56 57 ? 70 86 111
Asked in RRB NTPC 2026 — 16 June Shift 3 · Reasoning
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Correct answer: (B) 61
The differences between consecutive terms are perfect squares 1,4,9,16,25 (i.e., 1²,2²,3²,4²,5²); so the missing term = 56+1 = 57 (given) and the term before 70 is 57+4=61.
हिंदी में प्रश्न
दी गई श्रृंखला में '?' के स्थान पर क्या आना चाहिए? 56 57 70 86 111
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 64
क्रमागत पदों के बीच अंतर पूर्ण वर्ग 1,4,9,16,25 (यानी 1²,2²,3²,4²,5²) हैं; अतः लुप्त पद = 56+1 = 57 (दिया गया) और 70 से पहले का पद 57+4=61 है।
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