यदि \(a_1=4\) और \(a_{n+1}=2a_n+1\) है तो \(a_4-a_2\) का मान क्या होगा?
If \(a_1=4\) and \(a_{n+1}=2a_n+1\), what is the value of \(a_4-a_2\)?
Explanation opens after your attempt
B. (30)
Concept
The terms are (4,9,19,39), so \(a_4-a_2=39-9=30\). Exam tip: find both terms first and then subtract.
Why this answer is correct
The correct answer is B. (30). The terms are (4,9,19,39), so \(a_4-a_2=39-9=30\). Exam tip: find both terms first and then subtract.
Exam Tip
पद (4,9,19,39) हैं इसलिए \(a_4-a_2=39-9=30\) है। पहले दोनों पद निकालें फिर घटाएँ।
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