गुणोत्तर श्रेणी \(2,6,18,\ldots\) में कितने पदों तक योग (242) होगा?

How many terms of the geometric progression \(2,6,18,\ldots\) have sum (242)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (5)

Step 1

Concept

(S_n=2\(3^n-1\)/(3-1)=3^n-1), and \(3^n-1=242\) gives (n=5). In exams simplify the sum and identify the power.

Step 2

Why this answer is correct

The correct answer is B. (5). (S_n=2\(3^n-1\)/(3-1)=3^n-1), and \(3^n-1=242\) gives (n=5). In exams simplify the sum and identify the power.

Step 3

Exam Tip

(S_n=2\(3^n-1\)/(3-1)=3^n-1) और \(3^n-1=242\) से (n=5) है। परीक्षा में योग को सरल करके घात पहचानें।

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Mathematics Answer, Explanation and Revision Hints

गुणोत्तर श्रेणी \(2,6,18,\ldots\) में कितने पदों तक योग (242) होगा? / How many terms of the geometric progression \(2,6,18,\ldots\) have sum (242)?

Correct Answer: B. (5). Explanation: (S_n=2\(3^n-1\)/(3-1)=3^n-1) और \(3^n-1=242\) से (n=5) है। परीक्षा में योग को सरल करके घात पहचानें। / (S_n=2\(3^n-1\)/(3-1)=3^n-1), and \(3^n-1=242\) gives (n=5). In exams simplify the sum and identify the power.

Which concept should I revise for this Mathematics MCQ?

(S_n=2\(3^n-1\)/(3-1)=3^n-1), and \(3^n-1=242\) gives (n=5). In exams simplify the sum and identify the power.

What exam hint can help solve this Mathematics question?

(S_n=2\(3^n-1\)/(3-1)=3^n-1) और \(3^n-1=242\) से (n=5) है। परीक्षा में योग को सरल करके घात पहचानें।