एक समान्तर श्रेणी में \(a_{10}=31\) और \(a_{18}=55\) है। \(a_6\) क्या होगा?
In an AP, \(a_{10}=31\) and \(a_{18}=55\). What is \(a_6\)?
Explanation opens after your attempt
B. (19)
Concept
\(d=\frac{55-31}{8}=3\), so \(a_6=31-4\times3=19\). When moving backward from a known term, subtract (d).
Why this answer is correct
The correct answer is B. (19). \(d=\frac{55-31}{8}=3\), so \(a_6=31-4\times3=19\). When moving backward from a known term, subtract (d).
Exam Tip
\(d=\frac{55-31}{8}=3\), इसलिए \(a_6=31-4\times3=19\)। ज्ञात पद से पीछे आने पर (d) घटाएं।
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