यदि \(a_n=2\cdot5^{n-1}\) है, तो \(a_4\) क्या होगा?
If \(a_n=2\cdot5^{n-1}\), what is \(a_4\)?
Explanation opens after your attempt
Correct Answer
C. (250)
Concept
\(a_4=2\cdot5^3=250\). In a geometric rule, the exponent is (n-1).
Why this answer is correct
The correct answer is C. (250). \(a_4=2\cdot5^3=250\). In a geometric rule, the exponent is (n-1).
Exam Tip
\(a_4=2\cdot5^3=250\)। गुणोत्तर नियम में घात (n-1) होती है।
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