यदि \(a_1=100\) और \(a_{n+1}=a_n-3^n\) है तो \(a_4\) क्या होगा?

If \(a_1=100\) and \(a_{n+1}=a_n-3^n\), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

A. (61)

Step 1

Concept

The terms are (100,97,88,61), so \(a_4=61\). Exam tip: subtract (3,9,27) in order.

Step 2

Why this answer is correct

The correct answer is A. (61). The terms are (100,97,88,61), so \(a_4=61\). Exam tip: subtract (3,9,27) in order.

Step 3

Exam Tip

पद (100,97,88,61) हैं इसलिए \(a_4=61\) है। (3,9,27) को क्रम से घटाएँ।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=100\) और \(a_{n+1}=a_n-3^n\) है तो \(a_4\) क्या होगा? / If \(a_1=100\) and \(a_{n+1}=a_n-3^n\), what is \(a_4\)?

Correct Answer: A. (61). Explanation: पद (100,97,88,61) हैं इसलिए \(a_4=61\) है। (3,9,27) को क्रम से घटाएँ। / The terms are (100,97,88,61), so \(a_4=61\). Exam tip: subtract (3,9,27) in order.

Which concept should I revise for this Mathematics MCQ?

The terms are (100,97,88,61), so \(a_4=61\). Exam tip: subtract (3,9,27) in order.

What exam hint can help solve this Mathematics question?

पद (100,97,88,61) हैं इसलिए \(a_4=61\) है। (3,9,27) को क्रम से घटाएँ।