यदि \(a_1=180\) और (a_{n+1}=a_n-(n(n+2)+2^n)) है तो \(a_4\) क्या होगा?
If \(a_1=180\) and (a_{n+1}=a_n-(n(n+2)+2^n)), what is \(a_4\)?
Explanation opens after your attempt
C. (140)
Concept
The subtracted values are (5,12,23), so \(a_4=140\). Exam tip: calculate the full value before subtracting.
Why this answer is correct
The correct answer is C. (140). The subtracted values are (5,12,23), so \(a_4=140\). Exam tip: calculate the full value before subtracting.
Exam Tip
घटने वाले मान (5,12,23) हैं इसलिए \(a_4=140\) है। घटाने से पहले पूरा मान निकालें।
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