यदि गुणोत्तर श्रेणी के पहले (4) पदों का योग (780) है और (a=12) तथा (r=4) है, तो कथन कैसा है?

If the sum of the first (4) terms of a geometric progression is (780) with (a=12) and (r=4), what is the statement?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. सही क्योंकि \(S_4=780\)True because \(S_4=780\)

Step 1

Concept

(S_4=\frac{12\(4^4-1\)}{4-1}=1020), so the statement is false. In exams, verify statement-type questions carefully.

Step 2

Why this answer is correct

The correct answer is A. सही क्योंकि \(S_4=780\) / True because \(S_4=780\). (S_4=\frac{12\(4^4-1\)}{4-1}=1020), so the statement is false. In exams, verify statement-type questions carefully.

Step 3

Exam Tip

(S_4=\frac{12\(4^4-1\)}{4-1}=1020) नहीं; सीधे योग (12+48+192+768=1020) है, इसलिए कथन गलत है।

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Mathematics Answer, Explanation and Revision Hints

यदि गुणोत्तर श्रेणी के पहले (4) पदों का योग (780) है और (a=12) तथा (r=4) है, तो कथन कैसा है? / If the sum of the first (4) terms of a geometric progression is (780) with (a=12) and (r=4), what is the statement?

Correct Answer: A. सही क्योंकि \(S_4=780\) / True because \(S_4=780\). Explanation: (S_4=\frac{12\(4^4-1\)}{4-1}=1020) नहीं; सीधे योग (12+48+192+768=1020) है, इसलिए कथन गलत है। / (S_4=\frac{12\(4^4-1\)}{4-1}=1020), so the statement is false. In exams, verify statement-type questions carefully.

Which concept should I revise for this Mathematics MCQ?

(S_4=\frac{12\(4^4-1\)}{4-1}=1020), so the statement is false. In exams, verify statement-type questions carefully.

What exam hint can help solve this Mathematics question?

(S_4=\frac{12\(4^4-1\)}{4-1}=1020) नहीं; सीधे योग (12+48+192+768=1020) है, इसलिए कथन गलत है।