यदि \(a_1=80\) और \(a_{n+1}=a_n-20\) है तो \(a_4\) क्या होगा?
If \(a_1=80\) and \(a_{n+1}=a_n-20\), what is \(a_4\)?
Explanation opens after your attempt
B. (20)
Concept
The terms are (80,60,40,20), so \(a_4=20\). Exam tip: subtract (20) each time.
Why this answer is correct
The correct answer is B. (20). The terms are (80,60,40,20), so \(a_4=20\). Exam tip: subtract (20) each time.
Exam Tip
पद (80,60,40,20) हैं इसलिए \(a_4=20\) है। हर बार (20) घटाएँ।
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