यदि समांतर श्रेढ़ी का (n)वाँ पद \(a_n=2n+1\) है, तो पहले (6) पदों का योग कितना है?
If the (n)th term of an arithmetic progression is \(a_n=2n+1\), what is the sum of the first (6) terms?
Explanation opens after your attempt
B. (48)
Concept
The first (6) terms are (3,5,7,9,11,13), whose sum is (48). When \(a_n\) is given, find the first and last terms.
Why this answer is correct
The correct answer is B. (48). The first (6) terms are (3,5,7,9,11,13), whose sum is (48). When \(a_n\) is given, find the first and last terms.
Exam Tip
पहले (6) पद (3,5,7,9,11,13) हैं, जिनका योग (48) है। \(a_n\) दिया हो तो पहले और अंतिम पद निकालें।
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