यदि \(D_1=2\) और \(D_n=2D_{n-1}+n-1\) है, तो \(D_4\) का मान क्या होगा?
If \(D_1=2\) and \(D_n=2D_{n-1}+n-1\), what is the value of \(D_4\)?
Explanation opens after your attempt
D. सत्ताईस(27)
Concept
\(D_2=5\), \(D_3=12\), and \(D_4=27\). In exams, add (n-1) separately.
Why this answer is correct
The correct answer is D. सत्ताईस / (27). \(D_2=5\), \(D_3=12\), and \(D_4=27\). In exams, add (n-1) separately.
Exam Tip
\(D_2=5\), \(D_3=12\) और \(D_4=27\) है। परीक्षा में (n-1) को अलग से जोड़ें।
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