किसी अनुक्रम में \(P_1=0\) और \(P_n=P_{n-1}+3n^2-1\) है। \(P_4\) का मान क्या होगा?
In a sequence, \(P_1=0\) and \(P_n=P_{n-1}+3n^2-1\). What is the value of \(P_4\)?
Explanation opens after your attempt
C. चौरासी(84)
Concept
\(P_4=0+11+26+47=84\). In exams, calculate \(3n^2-1\) first.
Why this answer is correct
The correct answer is C. चौरासी / (84). \(P_4=0+11+26+47=84\). In exams, calculate \(3n^2-1\) first.
Exam Tip
\(P_4=0+11+26+47=84\) है। परीक्षा में \(3n^2-1\) को पहले निकालें।
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