समानांतर श्रेढ़ी \(40,35,30,25,\ldots\) में (5) कौन-सा पद है?
In the arithmetic progression \(40,35,30,25,\ldots\), which term is (5)?
Explanation opens after your attempt
C. (8)वाँ(8)th
Concept
(a_n=40+(n-1)(-5)), and (40-5(n-1)=5) gives (n=8). In a decreasing progression, the position is still positive.
Why this answer is correct
The correct answer is C. (8)वाँ / (8)th. (a_n=40+(n-1)(-5)), and (40-5(n-1)=5) gives (n=8). In a decreasing progression, the position is still positive.
Exam Tip
(a_n=40+(n-1)(-5)) और (40-5(n-1)=5) से (n=8)। घटती श्रेढ़ी में भी पद-संख्या धनात्मक होती है।
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