यदि \(a_1=90\) और (a_{n+1}=a_n-n(n+1)-2) है तो \(a_4\) क्या होगा?
If \(a_1=90\) and (a_{n+1}=a_n-n(n+1)-2), what is \(a_4\)?
Explanation opens after your attempt
A. (64)
Concept
The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.
Why this answer is correct
The correct answer is A. (64). The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.
Exam Tip
घटने वाले मान (4,8,14) हैं इसलिए (90-26=64) है। पहले पूरा घटाव लिखना गलती घटाता है।
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