यदि \(a_1=15\) और \(a_{n+1}=a_n-n\) है तो \(a_4\) क्या होगा?

If \(a_1=15\) and \(a_{n+1}=a_n-n\), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (9)

Step 1

Concept

The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).

Step 2

Why this answer is correct

The correct answer is C. (9). The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).

Step 3

Exam Tip

पद (15,14,12,9) हैं इसलिए \(a_4=9\) है। (n) को (1,2,3) के क्रम में घटाएँ।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=15\) और \(a_{n+1}=a_n-n\) है तो \(a_4\) क्या होगा? / If \(a_1=15\) and \(a_{n+1}=a_n-n\), what is \(a_4\)?

Correct Answer: C. (9). Explanation: पद (15,14,12,9) हैं इसलिए \(a_4=9\) है। (n) को (1,2,3) के क्रम में घटाएँ। / The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).

Which concept should I revise for this Mathematics MCQ?

The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).

What exam hint can help solve this Mathematics question?

पद (15,14,12,9) हैं इसलिए \(a_4=9\) है। (n) को (1,2,3) के क्रम में घटाएँ।