अनुक्रम \(1,3,7,15,31,\ldots\) में कौन सा पद (127) है?
In the sequence \(1,3,7,15,31,\ldots\), which term is (127)?
Explanation opens after your attempt
D. (7)वाँ(7)th
Concept
This sequence is \(2^n-1\), and \(2^7-1=127\). Exam tip: recognizing powers of (2) is useful.
Why this answer is correct
The correct answer is D. (7)वाँ / (7)th. This sequence is \(2^n-1\), and \(2^7-1=127\). Exam tip: recognizing powers of (2) is useful.
Exam Tip
यह अनुक्रम \(2^n-1\) है और \(2^7-1=127\) है। (2) की घातों को पहचानना उपयोगी है।
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