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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 (S_n=325), what will (n) be?Class 9Sequences and ProgressionsSum of first n natural numbersEasy MathematicsWhat is the (n)th term of the sequence (3,9,18,30,45,\ldots)?Class 9Sequences and Progressionsnth termExpert MathematicsA sequence has (n)th term \(a_n=\frac{n(n+1)}{2}\). What is \(a_{12}\)?Class 9Sequences and Progressionsnth termHard MathematicsIf \(a_n=\frac{n(n+1)}{2}\), what is \(a_8\)?Class 9Sequences and Progressionsnth termMedium MathematicsWhich rule represents the sequence (3,9,18,30,\ldots)?Class 9Sequences and ProgressionsExplicit or general ruleExpert MathematicsIf \(a_n=\frac{n(n+1)}{2}\), at which term will \(a_n=45\)?Class 9Sequences and ProgressionsExplicit or general ruleHard MathematicsIf \(a_n=\frac{n(n+1)}{2}+2\) then what is the value of \(a_6\)?Class 9Sequences and ProgressionsExplicit or general ruleMedium MathematicsWhat is the explicit rule for the sequence 1, 3, 6, 10, 15, …, where n = 1 gives the first term?Class 9Sequences and ProgressionsExplicit or general ruleHard MathematicsIf aₙ = n(n + 1)/2, which term will be equal to 28?Class 9Sequences and ProgressionsExplicit or general ruleMedium MathematicsWhat is the general term of the sequence (1, 3, 6, 10, …)?Class 9Sequences and ProgressionsExplicit or general ruleEasy MathematicsIf \(a_1=80\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}-1\), what is \(a_3\)?Class 9Sequences and ProgressionsRecursive ruleMedium MathematicsIf \(a_1=80\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}-1\), what is \(a_4\)?Class 9Sequences and ProgressionsRecursive ruleMedium MathematicsIf a₁ = 2 and aₙ₊₁ = aₙ + n(n + 1)/2 + 1, what is a₅?Class 9Sequences and ProgressionsRecursive ruleMedium MathematicsIf \(a_1=70\) and \(a_{n+1}=a_n-\frac{n(n+1)}{2}\), what is \(a_4\)?Class 9Sequences and ProgressionsRecursive ruleMedium MathematicsWhat will be the next term in the sequence (1,4,10,20,35,\ldots)?Class 9Sequences and ProgressionsSequencesExpert MathematicsIf \(a_n=\frac{n^2+n}{2}\), what will be the value of \(a_{18}\)?Class 9Sequences and ProgressionsSequencesExpert MathematicsIn the sequence (1,3,6,10,15,\ldots), which is the first term greater than (200)?Class 9Sequences and ProgressionsSequencesExpert MathematicsWhat will be the (20)th term in the sequence (3,6,10,15,21,\ldots)?Class 9Sequences and ProgressionsSequencesExpert MathematicsIn the sequence (1,3,6,10,15,\ldots), which term is (45)?Class 9Sequences and ProgressionsSequencesHard MathematicsWhat is the (7)th term of (1,3,6,10,15,\ldots)?Class 9Sequences and ProgressionsSequencesMedium