गुणोत्तर श्रेणी \(2,10,50,\ldots\) का वह पद कौन-सा है जो (1250) है?
Which term of the geometric progression \(2,10,50,\ldots\) is (1250)?
Explanation opens after your attempt
Correct Answer
B. पाँचवाँ पद(5)th term
Concept
From \(2\cdot5^{n-1}=1250\), \(5^{n-1}=625=5^4\) so (n=5). In exams compare powers to find the term number.
Why this answer is correct
The correct answer is B. पाँचवाँ पद / (5)th term. From \(2\cdot5^{n-1}=1250\), \(5^{n-1}=625=5^4\) so (n=5). In exams compare powers to find the term number.
Exam Tip
\(2\cdot5^{n-1}=1250\) से \(5^{n-1}=625=5^4\) इसलिए (n=5) है। परीक्षा में पद संख्या के लिए घात की तुलना करें।
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