समानांतर श्रेढ़ी \(90,82,74,66,\ldots\) में (18) कौन-सा पद है?
In the arithmetic progression \(90,82,74,66,\ldots\), which term is (18)?
Explanation opens after your attempt
B. (10)वाँ(10)th
Concept
From (90+(n-1)(-8)=18), (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 B. (10)वाँ / (10)th. From (90+(n-1)(-8)=18), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.
Exam Tip
(90+(n-1)(-8)=18) से (8(n-1)=72) और (n=10)। घटती श्रेढ़ी में भी वही \(a_n\) सूत्र लगता है।
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