श्रेणी \(81,27,9,3,1,\ldots\) का (n)वां पद क्या है?
What is the (n)th term of the sequence \(81,27,9,3,1,\ldots\)?
Explanation opens after your attempt
C. (81\left\(\frac{1}{3}\right\)^{n-1})
Concept
Each term is multiplied by \(\frac{1}{3}\), so (a_n=81\left\(\frac{1}{3}\right\)^{n-1}). Keep the first term fixed and use exponent (n-1).
Why this answer is correct
The correct answer is C. (81\left\(\frac{1}{3}\right\)^{n-1}). Each term is multiplied by \(\frac{1}{3}\), so (a_n=81\left\(\frac{1}{3}\right\)^{n-1}). Keep the first term fixed and use exponent (n-1).
Exam Tip
हर पद \(\frac{1}{3}\) गुना हो रहा है इसलिए (a_n=81\left\(\frac{1}{3}\right\)^{n-1})। पहले पद को सुरक्षित रखकर (n-1) घात लगाएं।
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