यदि \(a_1=90\) और \(a_{n+1}=a_n-2^n\) है तो \(a_4\) क्या होगा?
If \(a_1=90\) and \(a_{n+1}=a_n-2^n\), what is \(a_4\)?
Explanation opens after your attempt
B. (76)
Concept
The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.
Why this answer is correct
The correct answer is B. (76). The terms are (90,88,84,76), so \(a_4=76\). Exam tip: subtract (2,4,8) in order.
Exam Tip
पद (90,88,84,76) हैं इसलिए \(a_4=76\) है। (2,4,8) को क्रम से घटाएँ।
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