अनुक्रम \(15,11,7,3,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(15,11,7,3,\ldots\)?
Explanation opens after your attempt
A. (19-4n)
Concept
The first term is (15) and the difference is (-4), so (a_n=15+(n-1)(-4)=19-4n). Pay attention to the sign in a decreasing sequence.
Why this answer is correct
The correct answer is A. (19-4n). The first term is (15) and the difference is (-4), so (a_n=15+(n-1)(-4)=19-4n). Pay attention to the sign in a decreasing sequence.
Exam Tip
पहला पद (15) और अंतर (-4) है, इसलिए (a_n=15+(n-1)(-4)=19-4n)। घटती श्रेढ़ी में चिह्न पर ध्यान दें।
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