यदि \(a_1=30\) और (a_{n+1}=a_n-(-1)^n(2n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=30\) and (a_{n+1}=a_n-(-1)^n(2n+1)), what is \(a_4\)?
Explanation opens after your attempt
C. (35)
Concept
The terms are (30,33,28,35), so \(a_4=35\). Exam tip: track the minus sign and ((-1)^n) together.
Why this answer is correct
The correct answer is C. (35). The terms are (30,33,28,35), so \(a_4=35\). Exam tip: track the minus sign and ((-1)^n) together.
Exam Tip
पद (30,33,28,35) हैं इसलिए \(a_4=35\) है। ऋण चिह्न और ((-1)^n) को साथ में देखें।
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