Concept-wise Practice

ap-known-term-expert MCQ Questions for Class 10

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Practice Questions

1 questions tagged with ap-known-term-expert.

एक समान्तर श्रेणी में \(a_{21}=a_9+132\) और \(a_9=54\) है। \(a_{57}\) क्या होगा?

In an AP, \(a_{21}=a_9+132\) and \(a_9=54\). What is \(a_{57}\)?

Explanation opens after your attempt
Correct Answer

B. (570)

Step 1

Concept

(12d=132), so (d=11). \(a_{57}=a_9+48d=54+528=582\), so the options contain an error.

Step 2

Why this answer is correct

The correct answer is B. (570). (12d=132), so (d=11). \(a_{57}=a_9+48d=54+528=582\), so the options contain an error.

Step 3

Exam Tip

(12d=132), इसलिए (d=11)। \(a_{57}=a_9+48d=54+528=582\), इसलिए विकल्पों में त्रुटि है।

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