यदि \(a_1=120\) और (a_{n+1}=a_n-\(2^n+n\)) है तो \(a_5\) क्या होगा?

If \(a_1=120\) and (a_{n+1}=a_n-\(2^n+n\)), what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (80)

Step 1

Concept

The subtracted values are (3,6,11,20), so \(a_5=80\). Exam tip: write values of \(2^n+n\) first.

Step 2

Why this answer is correct

The correct answer is C. (80). The subtracted values are (3,6,11,20), so \(a_5=80\). Exam tip: write values of \(2^n+n\) first.

Step 3

Exam Tip

घटने वाले मान (3,6,11,20) हैं इसलिए \(a_5=80\) है। \(2^n+n\) के मान पहले लिखें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=120\) और (a_{n+1}=a_n-\(2^n+n\)) है तो \(a_5\) क्या होगा? / If \(a_1=120\) and (a_{n+1}=a_n-\(2^n+n\)), what is \(a_5\)?

Correct Answer: C. (80). Explanation: घटने वाले मान (3,6,11,20) हैं इसलिए \(a_5=80\) है। \(2^n+n\) के मान पहले लिखें। / The subtracted values are (3,6,11,20), so \(a_5=80\). Exam tip: write values of \(2^n+n\) first.

Which concept should I revise for this Mathematics MCQ?

The subtracted values are (3,6,11,20), so \(a_5=80\). Exam tip: write values of \(2^n+n\) first.

What exam hint can help solve this Mathematics question?

घटने वाले मान (3,6,11,20) हैं इसलिए \(a_5=80\) है। \(2^n+n\) के मान पहले लिखें।