यदि \(a_1=180\) और (a_{n+1}=a_n-(2n+1)2) है तो \(a_4\) क्या होगा?

If \(a_1=180\) and (a_{n+1}=a_n-(2n+1)2), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published: Updated:
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Correct Answer

D. (97)

Step 1

Concept

The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.

Step 2

Why this answer is correct

The correct answer is D. (97). The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.

Step 3

Exam Tip

घटने वाले वर्ग (9,25,49) हैं इसलिए \(a_4=97\) है। पहले वर्गों का योग निकालना आसान है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=180\) और (a_{n+1}=a_n-(2n+1)2) है तो \(a_4\) क्या होगा? / If \(a_1=180\) and (a_{n+1}=a_n-(2n+1)2), what is \(a_4\)?

Correct Answer: D. (97). Explanation: घटने वाले वर्ग (9,25,49) हैं इसलिए \(a_4=97\) है। पहले वर्गों का योग निकालना आसान है। / The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.

Which concept should I revise for this Mathematics MCQ?

The subtracted squares are (9,25,49), so \(a_4=97\). Exam tip: finding the sum of squares first is easier.

What exam hint can help solve this Mathematics question?

घटने वाले वर्ग (9,25,49) हैं इसलिए \(a_4=97\) है। पहले वर्गों का योग निकालना आसान है।