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 \(a_3\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (74)

Step 1

Concept

The terms are (80,78,74), so \(a_3=74\). Exam tip: calculate the full subtraction first.

Step 2

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.

Step 3

Exam Tip

पद (80,78,74) हैं इसलिए \(a_3=74\) है। घटाने से पहले पूरा मान निकालें।

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Mathematics Answer, Explanation and Revision Hints

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 \(a_3\)?

Correct Answer: B. (74). Explanation: पद (80,78,74) हैं इसलिए \(a_3=74\) है। घटाने से पहले पूरा मान निकालें। / The terms are (80,78,74), so \(a_3=74\). Exam tip: calculate the full subtraction first.

Which concept should I revise for this Mathematics MCQ?

The terms are (80,78,74), so \(a_3=74\). Exam tip: calculate the full subtraction first.

What exam hint can help solve this Mathematics question?

पद (80,78,74) हैं इसलिए \(a_3=74\) है। घटाने से पहले पूरा मान निकालें।