अनुक्रम \(10,20,40,80,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(10,20,40,80,\ldots\)?
Explanation opens after your attempt
Correct Answer
A. \(a_n=10\cdot2^{n-1}\)
Concept
The first term is (10) and the ratio is (2), so \(a_n=10\cdot2^{n-1}\). Use both first term and ratio in the general term.
Why this answer is correct
The correct answer is A. \(a_n=10\cdot2^{n-1}\). The first term is (10) and the ratio is (2), so \(a_n=10\cdot2^{n-1}\). Use both first term and ratio in the general term.
Exam Tip
पहला पद (10) और अनुपात (2) है, इसलिए \(a_n=10\cdot2^{n-1}\)। सामान्य पद में पहला पद और अनुपात दोनों रखें।
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