यदि \(a_1=60\) और (a_{n+1}=a_n-(3n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=60\) and (a_{n+1}=a_n-(3n+1)), what is \(a_4\)?
Explanation opens after your attempt
B. (39)
Concept
The terms are (60,56,49,39), so \(a_4=39\). Exam tip: calculate (3n+1) correctly before subtracting.
Why this answer is correct
The correct answer is B. (39). The terms are (60,56,49,39), so \(a_4=39\). Exam tip: calculate (3n+1) correctly before subtracting.
Exam Tip
पद (60,56,49,39) हैं इसलिए \(a_4=39\) है। घटाने से पहले (3n+1) सही निकालें।
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