यदि \(a_1=150\) और (a_{n+1}=a_n-n(n+2)-1) है तो \(a_4\) क्या होगा?
If \(a_1=150\) and (a_{n+1}=a_n-n(n+2)-1), what is \(a_4\)?
Explanation opens after your attempt
C. (121)
Concept
The subtracted values are (4,9,16), so \(a_4=121\). Exam tip: calculate the full subtraction before subtracting.
Why this answer is correct
The correct answer is C. (121). The subtracted values are (4,9,16), so \(a_4=121\). Exam tip: calculate the full subtraction before subtracting.
Exam Tip
घटने वाले मान (4,9,16) हैं इसलिए \(a_4=121\) है। पूरा घटाव निकालकर ही घटाएँ।
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