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double-plus-index MCQ Questions for Class 9

double-plus-index se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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2 questions tagged with double-plus-index.

Question 1/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 46

यदि \(a_1=6\) और \(a_{n+1}=2a_n+n\) है तो \(a_4\) क्या होगा?

If \(a_1=6\) and \(a_{n+1}=2a_n+n\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (59)

Step 1

Concept

The terms are (6,13,28,59), so \(a_4=59\). Exam tip: double the previous term and add (n).

Step 2

Why this answer is correct

The correct answer is C. (59). The terms are (6,13,28,59), so \(a_4=59\). Exam tip: double the previous term and add (n).

Step 3

Exam Tip

पद (6,13,28,59) हैं इसलिए \(a_4=59\) है। पिछले पद को दोगुना करके (n) जोड़ें।

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Question 2/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 45

यदि \(a_1=4\) और \(a_{n+1}=2a_n+n\) है तो \(a_4\) क्या होगा?

If \(a_1=4\) and \(a_{n+1}=2a_n+n\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (43)

Step 1

Concept

The terms are (4,9,20,43), so \(a_4=43\). Exam tip: double the previous term first and then add (n).

Step 2

Why this answer is correct

The correct answer is C. (43). The terms are (4,9,20,43), so \(a_4=43\). Exam tip: double the previous term first and then add (n).

Step 3

Exam Tip

पद (4,9,20,43) हैं इसलिए \(a_4=43\) है। पहले पिछले पद को दोगुना करें फिर (n) जोड़ें।

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