समांतर श्रेणी \(12,17,22,27,\ldots\) में \(a_n=72\) के लिए (n) क्या है?
In the arithmetic progression \(12,17,22,27,\ldots\), what is (n) for \(a_n=72\)?
Explanation opens after your attempt
C. (13)
Concept
(a_n=12+(n-1)5=5n+7), so (5n+7=72) gives (n=13). Form the general term and solve the equation.
Why this answer is correct
The correct answer is C. (13). (a_n=12+(n-1)5=5n+7), so (5n+7=72) gives (n=13). Form the general term and solve the equation.
Exam Tip
(a_n=12+(n-1)5=5n+7), इसलिए (5n+7=72) से (n=13)। सामान्य पद बनाकर समीकरण हल करें।
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