एक समान्तर श्रेणी में \(a_{11}=40\) और \(a_{19}=72\) है। \(a_4\) क्या होगा?

In an AP, \(a_{11}=40\) and \(a_{19}=72\). What is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (12)

Step 1

Concept

\(d=\frac{72-40}{8}=4\) and \(a_4=40-7\times4=12\). When moving backward from a known term, subtract (d).

Step 2

Why this answer is correct

The correct answer is C. (12). \(d=\frac{72-40}{8}=4\) and \(a_4=40-7\times4=12\). When moving backward from a known term, subtract (d).

Step 3

Exam Tip

\(d=\frac{72-40}{8}=4\) और \(a_4=40-7\times4=12\)। ज्ञात पद से पीछे जाने पर (d) घटाते जाएं।

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Mathematics Answer, Explanation and Revision Hints

एक समान्तर श्रेणी में \(a_{11}=40\) और \(a_{19}=72\) है। \(a_4\) क्या होगा? / In an AP, \(a_{11}=40\) and \(a_{19}=72\). What is \(a_4\)?

Correct Answer: C. (12). Explanation: \(d=\frac{72-40}{8}=4\) और \(a_4=40-7\times4=12\)। ज्ञात पद से पीछे जाने पर (d) घटाते जाएं। / \(d=\frac{72-40}{8}=4\) and \(a_4=40-7\times4=12\). When moving backward from a known term, subtract (d).

Which concept should I revise for this Mathematics MCQ?

\(d=\frac{72-40}{8}=4\) and \(a_4=40-7\times4=12\). When moving backward from a known term, subtract (d).

What exam hint can help solve this Mathematics question?

\(d=\frac{72-40}{8}=4\) और \(a_4=40-7\times4=12\)। ज्ञात पद से पीछे जाने पर (d) घटाते जाएं।