यदि गुणोत्तर श्रेणी \(x,,4x,,16x,\ldots\) में पाँचवाँ पद (1280) है, तो (x) क्या है?
If the fifth term of the geometric progression \(x,,4x,,16x,\ldots\) is (1280), what is (x)?
Explanation opens after your attempt
Correct Answer
C. (5)
Concept
The fifth term is \(x\cdot4^4=256x=1280\), so (x=5). In exams, put the algebraic first term in \(ar^{n-1}\) too.
Why this answer is correct
The correct answer is C. (5). The fifth term is \(x\cdot4^4=256x=1280\), so (x=5). In exams, put the algebraic first term in \(ar^{n-1}\) too.
Exam Tip
पाँचवाँ पद \(x\cdot4^4=256x=1280\) है, इसलिए (x=5) है। परीक्षा में बीजीय पहले पद को भी \(ar^{n-1}\) में रखें।
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