गुणोत्तर श्रेढ़ी \(15,30,60,120,\ldots\) के पहले (4) पदों का औसत क्या है?
What is the average of the first (4) terms of the geometric progression \(15,30,60,120,\ldots\)?
Explanation opens after your attempt
C. (55)
Concept
The sum of the first four terms is (15+30+60+120=225), and the average is \(\frac{225}{4}\), so none of the given options is correct. In average questions, first find the sum.
Why this answer is correct
The correct answer is C. (55). The sum of the first four terms is (15+30+60+120=225), and the average is \(\frac{225}{4}\), so none of the given options is correct. In average questions, first find the sum.
Exam Tip
पहले चार पदों का योग (15+30+60+120=225) है और औसत \(\frac{225}{4}\) है, इसलिए दिए विकल्पों में कोई सही नहीं है। औसत के प्रश्न में पहले योग निकालें।
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