RPF Constable practice question
Study the number series: 9, 10, 19, 29, 48, 77, ?. From the third term onward, each term is the sum of the two terms immediately before it. What number should replace the question mark?
From a RPF Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 125
The rule is Tn = T(n-1) + T(n-2). The two terms just before the missing term are 48 and 77, so the missing term = 48 + 77 = 125.
हिंदी में प्रश्न
इस संख्या श्रृंखला को देखिए: 9, 10, 19, 29, 48, 77, ?। तीसरे पद से शुरू करके, प्रत्येक पद अपने ठीक पहले वाले दो पदों का योग है। प्रश्न-चिह्न (?) के स्थान पर कौन-सी संख्या आएगी?
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सही उत्तर: (D) 125
नियम है: Tn = T(n-1) + T(n-2)। लुप्त पद से ठीक पहले वाले दो पद 48 और 77 हैं, इसलिए लुप्त पद = 48 + 77 = 125।
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