यदि \(a_1=30\) और \(a_{n+1}=a_n-\frac{n}{2}\) है तो \(a_4\) क्या होगा?
If \(a_1=30\) and \(a_{n+1}=a_n-\frac{n}{2}\), what is \(a_4\)?
Explanation opens after your attempt
B. (27)
Concept
\(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.
Why this answer is correct
The correct answer is B. (27). \(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.
Exam Tip
\(a_4=30-\frac{1+2+3}{2}=27\) है। भिन्न घटाते समय कुल घटाव पहले निकालें।
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