अनुक्रम \(18,15,12,9,\ldots\) के लिए recursive rule में क्या घटाया जाएगा?
For the sequence \(18,15,12,9,\ldots\), what is subtracted in the recursive rule?
Correct answer and explanation
B. 3
Simple Explanation
क्रमागत पदों का अंतर देखें: \(15-18=-3\), \(12-15=-3\) और \(9-12=-3\)। अतः प्रत्येक नया पद पाने के लिए पिछले पद में से 3 घटाया जाता है; recursive rule \(a_{n+1}=a_n-3\) होगा। 2 घटाने पर अगला पद 16 आता, जो दिए गए अनुक्रम से मेल नहीं खाता। परीक्षा टिप: recursive rule के लिए दो लगातार पदों का अंतर निकालें। / Check the differences between consecutive terms: \(15-18=-3\), \(12-15=-3\), and \(9-12=-3\). Therefore, 3 is subtracted from each previous term, so the recursive rule is \(a_{n+1}=a_n-3\). If 2 were subtracted, the next term would be 16, which does not match the sequence. Exam tip: find the difference between two consecutive terms to identify a recursive rule.
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