यदि \(a_1=1\) और \(a_{n+1}=a_n+5n\) है तो \(a_4\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+5n\), what is \(a_4\)?
Explanation opens after your attempt
Correct Answer
C. (31)
Concept
The terms are (1,6,16,31), so \(a_4=31\). Exam tip: (5n) changes at every step.
Why this answer is correct
The correct answer is C. (31). The terms are (1,6,16,31), so \(a_4=31\). Exam tip: (5n) changes at every step.
Exam Tip
पद (1,6,16,31) हैं इसलिए \(a_4=31\) है। (5n) का मान हर चरण में बदलता है।
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