समांतर श्रेणी \(72,64,56,48,\ldots\) में (0) कौन-सा पद है?
In the arithmetic progression \(72,64,56,48,\ldots\), which term is (0)?
Explanation opens after your attempt
C. (10)वाँ(10)th
Concept
From (72+(n-1)(-8)=0), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.
Why this answer is correct
The correct answer is C. (10)वाँ / (10)th. From (72+(n-1)(-8)=0), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.
Exam Tip
(72+(n-1)(-8)=0) से (8(n-1)=72) और (n=10)। घटती श्रेणी में भी वही \(a_n\) सूत्र लगता है।
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