यदि \(a_1=180\) और (a_{n+1}=a_n-(2n+1)2) है तो \(a_4\) क्या होगा?
If \(a_1=180\) and (a_{n+1}=a_n-(2n+1)2), what is \(a_4\)?
Explanation opens after your attempt
D. (97)
Concept
The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.
Why this answer is correct
The correct answer is D. (97). The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.
Exam Tip
घटने वाले वर्ग (9,25,49) हैं इसलिए \(a_4=97\) है। पहले वर्गों का योग निकालना आसान है।
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