यदि \(a_1=80\) और (a_{n+1}=a_n-\frac{n(n+1)}{2}-1) है तो \(a_3\) क्या होगा?
If \(a_1=80\) and (a_{n+1}=a_n-\frac{n(n+1)}{2}-1), what is \(a_3\)?
Explanation opens after your attempt
B. (74)
Concept
The terms are (80,78,74), so \(a_3=74\). Exam tip: calculate the full subtraction first.
Why this answer is correct
The correct answer is B. (74). The terms are (80,78,74), so \(a_3=74\). Exam tip: calculate the full subtraction first.
Exam Tip
पद (80,78,74) हैं इसलिए \(a_3=74\) है। घटाने से पहले पूरा मान निकालें।
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