RRB NTPC CBT-1 previous year question
Select the number that will come in place of the question mark (?) in the given series. 3, 8, 18, 38, ?
Asked in RRB NTPC 2026 — 16 June Shift 3 · Reasoning
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Correct answer: (C) 78
Each term is obtained as (previous term x 2) + 2: 3x2+2=8, 8x2+2=18, 18x2+2=38, 38x2+2=78.
हिंदी में प्रश्न
दी गई श्रृंखला में प्रश्नवाचक चिन्ह (?) के स्थान पर आने वाली संख्या चुनें। 3, 8, 18, 38, ?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 78
प्रत्येक पद (पिछला पद × 2) + 2 से प्राप्त होता है: 3×2+2=8, 8×2+2=18, 18×2+2=38, 38×2+2=78।
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