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)?

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Correct Answer

B. (10)वाँ(10)th

Step 1

Concept

From (90+(n-1)(-8)=18), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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)?

Correct Answer: B. (10)वाँ / (10)th. Explanation: (90+(n-1)(-8)=18) से (8(n-1)=72) और (n=10)। घटती श्रेढ़ी में भी वही \(a_n\) सूत्र लगता है। / From (90+(n-1)(-8)=18), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.

Which concept should I revise for this Mathematics MCQ?

From (90+(n-1)(-8)=18), (8(n-1)=72) and (n=10). The same \(a_n\) formula works in a decreasing progression.

What exam hint can help solve this Mathematics question?

(90+(n-1)(-8)=18) से (8(n-1)=72) और (n=10)। घटती श्रेढ़ी में भी वही \(a_n\) सूत्र लगता है।