यदि \(a_1=90\) और \(a_{n+1}=a_n-2^n\) है तो \(a_4\) क्या होगा?

If \(a_1=90\) and \(a_{n+1}=a_n-2^n\), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (76)

Step 1

Concept

The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.

Step 2

Why this answer is correct

The correct answer is B. (76). The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.

Step 3

Exam Tip

पद (90,88,84,76) हैं इसलिए \(a_4=76\) है। (2,4,8) को क्रम से घटाएँ।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=90\) और \(a_{n+1}=a_n-2^n\) है तो \(a_4\) क्या होगा? / If \(a_1=90\) and \(a_{n+1}=a_n-2^n\), what is \(a_4\)?

Correct Answer: B. (76). Explanation: पद (90,88,84,76) हैं इसलिए \(a_4=76\) है। (2,4,8) को क्रम से घटाएँ। / The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.

Which concept should I revise for this Mathematics MCQ?

The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.

What exam hint can help solve this Mathematics question?

पद (90,88,84,76) हैं इसलिए \(a_4=76\) है। (2,4,8) को क्रम से घटाएँ।