समानांतर श्रेढ़ी \(35,31,27,23,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the arithmetic progression \(35,31,27,23,\ldots\)?
Explanation opens after your attempt
B. \(a_n=39-4n\)
Concept
The first term is (35) and the difference is (-4), so (a_n=35+(n-1)(-4)=39-4n). In a decreasing progression the common difference is negative.
Why this answer is correct
The correct answer is B. \(a_n=39-4n\). The first term is (35) and the difference is (-4), so (a_n=35+(n-1)(-4)=39-4n). In a decreasing progression the common difference is negative.
Exam Tip
पहला पद (35) और अंतर (-4) है इसलिए (a_n=35+(n-1)(-4)=39-4n)। घटती श्रेढ़ी में समान अंतर ऋणात्मक होता है।
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