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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।

MathematicsWhich condition is necessary and sufficient for a positive integer \(T\) to be the sum of the first \(n\) natural numbers for some positive integer \(n\)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf (S_n-S_{50}=1575), what is the value of (n)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf (S_n=1081), what is the value of (S_{n+4}-S_n)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsWhen is the sum \(S_n\) of the first n natural numbers odd?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf (S_n=5050), what is the value of (S_{n-10})?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf \(S_n=\frac{n(n+1)}{2}\) and \(S_n=861\), what is the value of (n)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf (S_a=820) and (S_b=1035), what is (b-a)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 59Medium MathematicsIn a triangular decoration, flowers are arranged in rows from 1 to 28. How many flowers are there in total?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 59Easy MathematicsIf (S_p=378) and (S_q=528), what is the value of (q-p)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 59Medium MathematicsIf the sum of the first n natural numbers is 2701, what is the value of n?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 61Medium MathematicsIf (S_n=2850), what will be the value of (S_{n-5})?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 61Medium MathematicsIf Sₙ = 231, what will be Sₙ₊₄?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 61Medium MathematicsIf (S_n=1176), what will be (S_{n-1})?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 61Medium MathematicsIf (S_n=666), what will be (S_{n+1})?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 61Medium MathematicsIf (S_a=351) and (S_b=465), what is (b-a)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Medium MathematicsIf (S_m=210) and (S_n=325), what is the value of (n-m)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Medium MathematicsIf (S_n=1128), what will (n) be?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 64Easy MathematicsIf (S_n=325), what will (n) be?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 62Easy MathematicsWhat is the (n)th term of the sequence (3,9,18,30,45,\ldots)?Class 9Sequences and Progressionsnth termLevel 57Expert MathematicsA sequence has (n)th term \(a_n=\frac{n(n+1)}{2}\). What is \(a_{12}\)?Class 9Sequences and Progressionsnth termLevel 57Hard