अनुक्रम \(21,16,11,6,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(21,16,11,6,\ldots\)?
Explanation opens after your attempt
A. (26-5n)
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.
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.
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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