अनुक्रम \(21,16,11,6,\ldots\) का (n)वाँ पद कौन-सा है?

What is the (n)th term of the sequence \(21,16,11,6,\ldots\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (26-5n)

Step 1

Concept

The first term is (21) and the difference is (-5), so (a_n=21+(n-1)(-5)=26-5n). In a decreasing sequence, the difference is negative.

Step 2

Why this answer is correct

The correct answer is A. (26-5n). The first term is (21) and the difference is (-5), so (a_n=21+(n-1)(-5)=26-5n). In a decreasing sequence, the difference is negative.

Step 3

Exam Tip

पहला पद (21) और अंतर (-5) है, इसलिए (a_n=21+(n-1)(-5)=26-5n)। घटती श्रेढ़ी में अंतर ऋणात्मक होता है।

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Mathematics Answer, Explanation and Revision Hints

अनुक्रम \(21,16,11,6,\ldots\) का (n)वाँ पद कौन-सा है? / What is the (n)th term of the sequence \(21,16,11,6,\ldots\)?

Correct Answer: A. (26-5n). Explanation: पहला पद (21) और अंतर (-5) है, इसलिए (a_n=21+(n-1)(-5)=26-5n)। घटती श्रेढ़ी में अंतर ऋणात्मक होता है। / The first term is (21) and the difference is (-5), so (a_n=21+(n-1)(-5)=26-5n). In a decreasing sequence, the difference is negative.

Which concept should I revise for this Mathematics MCQ?

The first term is (21) and the difference is (-5), so (a_n=21+(n-1)(-5)=26-5n). In a decreasing sequence, the difference is negative.

What exam hint can help solve this Mathematics question?

पहला पद (21) और अंतर (-5) है, इसलिए (a_n=21+(n-1)(-5)=26-5n)। घटती श्रेढ़ी में अंतर ऋणात्मक होता है।