अनुक्रम \(17,22,27,32,\ldots\) में \(a_n=87\) के लिए (n) क्या है?
In the sequence \(17,22,27,32,\ldots\), what is (n) for \(a_n=87\)?
Explanation opens after your attempt
C. (15)
Concept
(a_n=17+(n-1)5=5n+12), so (5n+12=87) gives (n=15). Set the rule equal to the given term.
Why this answer is correct
The correct answer is C. (15). (a_n=17+(n-1)5=5n+12), so (5n+12=87) gives (n=15). Set the rule equal to the given term.
Exam Tip
(a_n=17+(n-1)5=5n+12), इसलिए (5n+12=87) से (n=15)। नियम को दिए पद के बराबर रखें।
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