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 \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (35)

Step 1

Concept

The terms are (30,33,28,35), so \(a_4=35\). Exam tip: track the minus sign and ((-1)^n) together.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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 \(a_4\)?

Correct Answer: C. (35). Explanation: पद (30,33,28,35) हैं इसलिए \(a_4=35\) है। ऋण चिह्न और ((-1)^n) को साथ में देखें। / The terms are (30,33,28,35), so \(a_4=35\). Exam tip: track the minus sign and ((-1)^n) together.

Which concept should I revise for this Mathematics MCQ?

The terms are (30,33,28,35), so \(a_4=35\). Exam tip: track the minus sign and ((-1)^n) together.

What exam hint can help solve this Mathematics question?

पद (30,33,28,35) हैं इसलिए \(a_4=35\) है। ऋण चिह्न और ((-1)^n) को साथ में देखें।