RRB NTPC CBT-1 practice question
Study the series: 4, 13, 41, 126, 382, 1151, ? Each term is obtained from the previous term by multiplying by 3 and then adding a number that itself changes by +1 each step (the amounts added are 1, 2, 3, 4, 5). Find the pattern and determine the next term.
From a RRB NTPC CBT-1 Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 3459
Series: 4, 13, 41, 126, 382, 1151, 3459. Rule: term(n+1) = term(n) × 3 + k, where k takes values 1, 2, 3, 4, 5, 6 respectively (an arithmetic progression with common difference 1). To get the 7th term: 1151 × 3 + 6 = 3453 + 6 = 3459.
हिंदी में प्रश्न
श्रृंखला देखें: 4, 13, 41, 126, 382, 1151, ? प्रत्येक पद पिछले पद को 3 से गुणा करके फिर एक संख्या जोड़ा गया करके प्राप्त होता है, और यह संख्या हर चरण में +1 से बदलती है (जोड़ी गई संख्याएँ हैं: 1, 2, 3, 4, 5)। पैटर्न पहचानकर अगला पद ज्ञात कीजिए।
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सही उत्तर: (A) 3459
श्रृंखला: 4, 13, 41, 126, 382, 1151, 3459। नियम: पद(n+1) = पद(n) × 3 + k, जहाँ k क्रमशः 1, 2, 3, 4, 5, 6 है (यह एक समान्तर श्रेणी है जिसका सार्व अंतर 1 है)। सातवाँ पद ज्ञात करने के लिए: 1151 × 3 + 6 = 3453 + 6 = 3459।
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