यदि \(a_1=90\) और (a_{n+1}=a_n-n(n+1)-2) है तो \(a_4\) क्या होगा?

If \(a_1=90\) and (a_{n+1}=a_n-n(n+1)-2), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (64)

Step 1

Concept

The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.

Step 2

Why this answer is correct

The correct answer is A. (64). The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.

Step 3

Exam Tip

घटने वाले मान (4,8,14) हैं इसलिए (90-26=64) है। पहले पूरा घटाव लिखना गलती घटाता है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=90\) और (a_{n+1}=a_n-n(n+1)-2) है तो \(a_4\) क्या होगा? / If \(a_1=90\) and (a_{n+1}=a_n-n(n+1)-2), what is \(a_4\)?

Correct Answer: A. (64). Explanation: घटने वाले मान (4,8,14) हैं इसलिए (90-26=64) है। पहले पूरा घटाव लिखना गलती घटाता है। / The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.

Which concept should I revise for this Mathematics MCQ?

The subtracted values are (4,8,14), so (90-26=64). Exam tip: write the full subtraction first to avoid mistakes.

What exam hint can help solve this Mathematics question?

घटने वाले मान (4,8,14) हैं इसलिए (90-26=64) है। पहले पूरा घटाव लिखना गलती घटाता है।