समांतर श्रेणी \(64,57,50,43,\ldots\) में (8) कौन-सा पद है?
In the arithmetic progression \(64,57,50,43,\ldots\), which term is (8)?
Explanation opens after your attempt
B. (9)वाँ(9)th
Concept
From (64+(n-1)(-7)=8), (7(n-1)=56) and (n=9). The same \(a_n\) formula works in a decreasing progression.
Why this answer is correct
The correct answer is B. (9)वाँ / (9)th. From (64+(n-1)(-7)=8), (7(n-1)=56) and (n=9). The same \(a_n\) formula works in a decreasing progression.
Exam Tip
(64+(n-1)(-7)=8) से (7(n-1)=56) और (n=9)। घटती श्रेणी में भी वही \(a_n\) सूत्र लगता है।
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