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alternating-linear MCQ Questions for Class 9

alternating-linear 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 alternating-linear.

Question 1/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 47

यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_4\) क्या होगा?

If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

B. (5)

Step 1

Concept

The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

Step 2

Why this answer is correct

The correct answer is B. (5). The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

Step 3

Exam Tip

पद (12,8,15,5) हैं इसलिए \(a_4=5\) है। सम और विषम (n) पर चिह्न बदलता है।

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Question 2/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 47

यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_5\) क्या होगा?

If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_5\)?

Explanation opens after your attempt
Correct Answer

C. (8)

Step 1

Concept

The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

Step 2

Why this answer is correct

The correct answer is C. (8). The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

Step 3

Exam Tip

पद (12,8,15,5,18) हैं इसलिए \(a_5=18\) है। सही विकल्पों में (18) होना चाहिए।

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