अनुक्रम \(1,7,17,31,\ldots\) के लिए कौन-सा (n)वाँ पद सही है?
Which (n)th term is correct for the sequence \(1,7,17,31,\ldots\)?
Explanation opens after your attempt
Correct Answer
A. \(a_n=2n^2-1\)
Concept
At (n=1,2,3,4), it gives (1,7,17,31). In exams, test options on the starting terms.
Why this answer is correct
The correct answer is A. \(a_n=2n^2-1\). At (n=1,2,3,4), it gives (1,7,17,31). In exams, test options on the starting terms.
Exam Tip
(n=1,2,3,4) पर (1,7,17,31) मिलते हैं। परीक्षा में विकल्पों को शुरुआती पदों पर जाँचें।
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