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Triangular Numbers

Class 9 Mathematics के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

MathematicsIf \(a_n=\frac{n(n+1)}{2}\), what is \(a_8\)?Class 9Sequences and Progressionsnth termLevel 56Medium MathematicsWhich rule represents the sequence (3,9,18,30,\ldots)?Class 9Sequences and ProgressionsExplicit or general ruleLevel 48Expert MathematicsIf \(a_n=\frac{n(n+1)}{2}\), at which term will \(a_n=45\)?Class 9Sequences and ProgressionsExplicit or general ruleLevel 49Hard MathematicsIf \(a_n=\frac{n(n+1)}{2}+2\) then what is the value of \(a_6\)?Class 9Sequences and ProgressionsExplicit or general ruleLevel 48Medium MathematicsIf aₙ = n(n + 1)/2, which term will be equal to 28?Class 9Sequences and ProgressionsExplicit or general ruleLevel 47Medium MathematicsWhat is the general term of the sequence (1, 3, 6, 10, …)?Class 9Sequences and ProgressionsExplicit or general ruleLevel 50Easy MathematicsIf \(a_1=80\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}-1\), what is \(a_3\)?Class 9Sequences and ProgressionsRecursive ruleLevel 46Medium MathematicsIf \(a_1=80\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}-1\), what is \(a_4\)?Class 9Sequences and ProgressionsRecursive ruleLevel 46Medium MathematicsIf \(a_1=70\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}\), what is \(a_4\)?Class 9Sequences and ProgressionsRecursive ruleLevel 45Medium MathematicsWhat will be the next term in the sequence (1,4,10,20,35,\ldots)?Class 9Sequences and ProgressionsSequencesLevel 43Expert MathematicsIf \(a_n=\frac{n^2+n}{2}\), what will be the value of \(a_{18}\)?Class 9Sequences and ProgressionsSequencesLevel 43Expert MathematicsIn the sequence (1,3,6,10,15,\ldots), which is the first term greater than (200)?Class 9Sequences and ProgressionsSequencesLevel 42Expert MathematicsWhat will be the (20)th term in the sequence (3,6,10,15,21,\ldots)?Class 9Sequences and ProgressionsSequencesLevel 41Expert MathematicsIn the sequence (1,3,6,10,15,\ldots), which term is (45)?Class 9Sequences and ProgressionsSequencesLevel 44Hard MathematicsWhat is the (7)th term of (1,3,6,10,15,\ldots)?Class 9Sequences and ProgressionsSequencesLevel 41Medium MathematicsWhat is the next term of (1,3,6,10,15,\ldots)?Class 9Sequences and ProgressionsSequencesLevel 46Easy MathematicsWhat is the next term in (1,3,6,10,\ldots)?Class 9Sequences and ProgressionsSequencesLevel 45Easy