अनुक्रम \(9,19,29,39,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(9,19,29,39,\ldots\)?
Explanation opens after your attempt
A. (10n-1)
Concept
The first term is (9) and the difference is (10), so (a_n=9+(n-1)10=10n-1). Check by putting (n=1).
Why this answer is correct
The correct answer is A. (10n-1). The first term is (9) and the difference is (10), so (a_n=9+(n-1)10=10n-1). Check by putting (n=1).
Exam Tip
पहला पद (9) और अंतर (10) है, इसलिए (a_n=9+(n-1)10=10n-1)। पहले पद पर (n=1) रखकर जांचें।
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