गुणोत्तर श्रेणी \(3,15,75,375,\ldots\) के पहले (5) पदों का योग क्या है?
What is the sum of the first (5) terms of the geometric progression \(3,15,75,375,\ldots\)?
Explanation opens after your attempt
B. (2343)
Concept
(S_5=3\(5^5-1\)/(5-1)=2343). In exams the formula saves time for large ratios.
Why this answer is correct
The correct answer is B. (2343). (S_5=3\(5^5-1\)/(5-1)=2343). In exams the formula saves time for large ratios.
Exam Tip
(S_5=3\(5^5-1\)/(5-1)=2343) है। परीक्षा में बड़े अनुपात में सूत्र से समय बचता है।
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