यदि \(a_1=80\) और \(a_{n+1}=a_n-\frac{7n}{2}\) है तो \(a_5\) क्या होगा?
If \(a_1=80\) and \(a_{n+1}=a_n-\frac{7n}{2}\), what is \(a_5\)?
Explanation opens after your attempt
A. (45)
Concept
The total subtraction is (\frac{7(1+2+3+4)}{2}=35), so \(a_5=45\). Exam tip: add fractional subtractions first.
Why this answer is correct
The correct answer is A. (45). The total subtraction is (\frac{7(1+2+3+4)}{2}=35), so \(a_5=45\). Exam tip: add fractional subtractions first.
Exam Tip
कुल घटाव (\frac{7(1+2+3+4)}{2}=35) है इसलिए \(a_5=45\) है। भिन्न घटावों को पहले जोड़ें।
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