यदि \(a_1=3\) और \(a_{n+1}=a_n+2^n-n\) है तो \(a_5\) क्या होगा?
If \(a_1=3\) and \(a_{n+1}=a_n+2^n-n\), what is \(a_5\)?
Explanation opens after your attempt
C. (22)
Concept
The added values are (1,2,5,12), so \(a_5=23\). Exam tip: find the values of \(2^n-n\) first.
Why this answer is correct
The correct answer is C. (22). The added values are (1,2,5,12), so \(a_5=23\). Exam tip: find the values of \(2^n-n\) first.
Exam Tip
जुड़ने वाले मान (1,2,5,12) हैं इसलिए \(a_5=23\) नहीं बल्कि (23) है। \(2^n-n\) के मान पहले निकालें।
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