Class 9 Mathematics - Sequences and Progressions - Arithmetic Progression Expert Quiz

Mathematics Sequences and Progressions Arithmetic Progression Expert Class 9 Level 44

Level 44 • 2/50 questions • 25 seconds per question.

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Question 1/2 Expert Mathematics Sequences and Progressions Recursive rule Class 9 Level 44

किसी अनुक्रम में \(a_1=3\) और \(a_n=2a_{n-1}+1\) है। \(a_4\) का मान क्या होगा?

In a sequence, \(a_1=3\) and \(a_n=2a_{n-1}+1\). What will be the value of \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. इकतीस(31)

Step 1

Concept

First \(a_2=7\), then \(a_3=15\), and finally \(a_4=31\). In exams, apply the recursive rule step by step.

Step 2

Why this answer is correct

The correct answer is C. इकतीस / (31). First \(a_2=7\), then \(a_3=15\), and finally \(a_4=31\). In exams, apply the recursive rule step by step.

Step 3

Exam Tip

पहले \(a_2=7\), फिर \(a_3=15\) और अंत में \(a_4=31\) मिलता है। परीक्षा में पुनरावर्ती नियम को क्रम से लागू करें।

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Question 2/2 Expert Mathematics Sequences and Progressions Recursive rule Class 9 Level 44

किसी अनुक्रम में \(t_1=2\), \(t_2=5\) और \(t_n=t_{n-1}+2t_{n-2}\) है। \(t_5\) का मान क्या होगा?

In a sequence, \(t_1=2\), \(t_2=5\), and \(t_n=t_{n-1}+2t_{n-2}\). What will be the value of \(t_5\)?

Explanation opens after your attempt
Correct Answer

D. सैंतीस(37)

Step 1

Concept

We get \(t_3=9\), \(t_4=19\), and \(t_5=37\). In exams, use the previous two terms carefully.

Step 2

Why this answer is correct

The correct answer is D. सैंतीस / (37). We get \(t_3=9\), \(t_4=19\), and \(t_5=37\). In exams, use the previous two terms carefully.

Step 3

Exam Tip

\(t_3=9\), \(t_4=19\) और \(t_5=37\) मिलता है। परीक्षा में पिछले दो पदों का सही उपयोग करें।

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