यदि \(a_1=1\) और \(a_{n+1}=a_n+2^n\) है तो \(a_5\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+2^n\), what is \(a_5\)?
Explanation opens after your attempt
C. (31)
Concept
The terms are (1,3,7,15,31), so \(a_5=31\). Exam tip: add (2,4,8,16) in order.
Why this answer is correct
The correct answer is C. (31). The terms are (1,3,7,15,31), so \(a_5=31\). Exam tip: add (2,4,8,16) in order.
Exam Tip
पद (1,3,7,15,31) हैं इसलिए \(a_5=31\) है। \(2^n\) के मान (2,4,8,16) क्रम से जोड़ें।
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