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

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

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

D. (23)

Step 1

Concept

The terms are (2,5,11,23), so \(a_4=23\). Exam tip: double first and then add (1).

Step 2

Why this answer is correct

The correct answer is D. (23). The terms are (2,5,11,23), so \(a_4=23\). Exam tip: double first and then add (1).

Step 3

Exam Tip

पद (2,5,11,23) हैं इसलिए \(a_4=23\) है। पहले दोगुना करें फिर (1) जोड़ें।

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Mathematics Answer, Explanation and Revision Hints

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

Correct Answer: D. (23). Explanation: पद (2,5,11,23) हैं इसलिए \(a_4=23\) है। पहले दोगुना करें फिर (1) जोड़ें। / The terms are (2,5,11,23), so \(a_4=23\). Exam tip: double first and then add (1).

Which concept should I revise for this Mathematics MCQ?

The terms are (2,5,11,23), so \(a_4=23\). Exam tip: double first and then add (1).

What exam hint can help solve this Mathematics question?

पद (2,5,11,23) हैं इसलिए \(a_4=23\) है। पहले दोगुना करें फिर (1) जोड़ें।