अनुक्रम \(40,35,30,25,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(40,35,30,25,\ldots\)?
Explanation opens after your attempt
A. (45-5n)
Concept
The first term is (40) and the difference is (-5), so (a_n=40+(n-1)(-5)=45-5n). In a decreasing sequence, take the difference as negative.
Why this answer is correct
The correct answer is A. (45-5n). The first term is (40) and the difference is (-5), so (a_n=40+(n-1)(-5)=45-5n). In a decreasing sequence, take the difference as negative.
Exam Tip
पहला पद (40) और अंतर (-5) है, इसलिए (a_n=40+(n-1)(-5)=45-5n)। घटती श्रेढ़ी में अंतर को ऋणात्मक लें।
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