यदि \(a_1=18\) और \(a_{n+1}=a_n-3\) है तो \(a_4\) क्या होगा?
If \(a_1=18\) and \(a_{n+1}=a_n-3\), what is \(a_4\)?
Explanation opens after your attempt
D. (9)
Concept
The terms are (18,15,12,9), so \(a_4=9\). Exam tip: keep the sign correct in subtraction rules.
Why this answer is correct
The correct answer is D. (9). The terms are (18,15,12,9), so \(a_4=9\). Exam tip: keep the sign correct in subtraction rules.
Exam Tip
पद (18,15,12,9) हैं इसलिए \(a_4=9\) है। घटाने वाले नियम में चिह्न सही रखें।
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