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add-3n MCQ Questions for Class 9

add-3n 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 add-3n.

Question 1/2 Easy Mathematics Sequences and Progressions Recursive rule Class 9 Level 49

यदि \(a_1=5\) और \(a_{n+1}=a_n+3n\) है तो \(a_4\) क्या होगा?

If \(a_1=5\) and \(a_{n+1}=a_n+3n\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

D. (23)

Step 1

Concept

The terms are (5,8,14,23), so \(a_4=23\). Exam tip: find (3n) first and then add.

Step 2

Why this answer is correct

The correct answer is D. (23). The terms are (5,8,14,23), so \(a_4=23\). Exam tip: find (3n) first and then add.

Step 3

Exam Tip

पद (5,8,14,23) हैं इसलिए \(a_4=23\) है। पहले (3n) निकालें फिर जोड़ें।

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

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

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

Explanation opens after your attempt
Correct Answer

D. (19)

Step 1

Concept

The terms are (1,4,10,19), so \(a_4=19\). Exam tip: (3n) changes at every step.

Step 2

Why this answer is correct

The correct answer is D. (19). The terms are (1,4,10,19), so \(a_4=19\). Exam tip: (3n) changes at every step.

Step 3

Exam Tip

पद (1,4,10,19) हैं इसलिए \(a_4=19\) है। (3n) का मान हर चरण बदलता है।

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