किसी अनुक्रम में \(F_1=90\) और (F_n=F_{n-1}-n(n+1)) है। \(F_4\) का मान क्या होगा?
In a sequence, \(F_1=90\) and (F_n=F_{n-1}-n(n+1)). What is the value of \(F_4\)?
Explanation opens after your attempt
A. बावन(52)
Concept
\(F_4=90-6-12-20=52\). In exams, subtract (n(n+1)), do not add it.
Why this answer is correct
The correct answer is A. बावन / (52). \(F_4=90-6-12-20=52\). In exams, subtract (n(n+1)), do not add it.
Exam Tip
\(F_4=90-6-12-20=52\) है। परीक्षा में (n(n+1)) को घटाएँ, जोड़ें नहीं।
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