यदि \(B_1=11\) और \(B_n=B_{n-1}+2^n-n\) है, तो \(B_4\) का मान क्या होगा?
If \(B_1=11\) and \(B_n=B_{n-1}+2^n-n\), what is the value of \(B_4\)?
Explanation opens after your attempt
A. तीस(30)
Concept
\(B_4=11+2+5+12=30\). In exams, calculate \(2^n-n\) at each step.
Why this answer is correct
The correct answer is A. तीस / (30). \(B_4=11+2+5+12=30\). In exams, calculate \(2^n-n\) at each step.
Exam Tip
\(B_4=11+2+5+12=30\) है। परीक्षा में \(2^n-n\) को हर चरण पर निकालें।
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