यदि किसी गुणोत्तर श्रेणी के पहले (4) पद (7,21,63,189) हैं, तो \(S_4\) क्या है?
If the first (4) terms of a geometric progression are (7,21,63,189), what is \(S_4\)?
Explanation opens after your attempt
A. (280)
Concept
The sum is (7+21+63+189=280). In exams, direct addition is also fast for small (n).
Why this answer is correct
The correct answer is A. (280). The sum is (7+21+63+189=280). In exams, direct addition is also fast for small (n).
Exam Tip
योग (7+21+63+189=280) है। परीक्षा में छोटे (n) के लिए सीधे जोड़ना भी तेज होता है।
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