यदि \(a_1=50\) और \(a_{n+1}=a_n-n^2\) है तो \(a_5\) क्या होगा?
If \(a_1=50\) and \(a_{n+1}=a_n-n^2\), what is \(a_5\)?
Explanation opens after your attempt
A. (20)
Concept
The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.
Why this answer is correct
The correct answer is A. (20). The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.
Exam Tip
पद (50,49,45,36,20) हैं इसलिए \(a_5=20\) है। वर्गों (1,4,9,16) को क्रम से घटाएँ।
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