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In the arithmetic progression (3,9,15,21,\ldots), what is the sum of (a) and (d)?समांतर श्रेढ़ी (3,9,15,21,\ldots) में (a) और (d) का योग क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(9\)\(9\)
The first term of the given AP is \(a=3\). Its common difference is \(d=9-3=6\). Hence, \(a+d=3+6=9\). Note that \(6\) is only the common difference, not the required sum. Exam tip: Find \(d\) by subtracting a term from the term immediately after it.दी गई समांतर श्रेणी का प्रथम पद \(a=3\) है। सार्वांतर \(d=9-3=6\) होगा। अतः \(a+d=3+6=9\)। \(6\) केवल सार्वांतर है, योग नहीं। परीक्षा टिप: \(d\) ज्ञात करने के लिए किसी पद में से उसके ठीक पहले वाले पद को घटाएँ।
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