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Series Formula

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

MathematicsWhat is the sum of natural numbers from (50) to (150)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Expert MathematicsA student added numbers from (1) to (120) and then subtracted the sum from (1) to (80). What will be the result?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsIf \(S_n=\frac{n(n+1)}{2}\), what is the value of \(S_{2n}\) when \(n=15\)?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 60Hard MathematicsWhat is the value of (S_{22}+S_{17})?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 59Medium MathematicsA workbook asks (1+2+3+\cdots+70). What is the answer?Class 9Sequences and ProgressionsSum of first n natural numbersLevel 64Easy MathematicsWhat is the sum of the first (9) terms of the geometric progression (15,30,60,\ldots)?Class 9Sequences and ProgressionsGeometric ProgressionLevel 55Hard MathematicsWhat is the sum of the first (14) terms of the arithmetic progression (11,18,25,\ldots)?Class 9Sequences and ProgressionsArithmetic ProgressionLevel 52Hard MathematicsWhat is the sum of the first (20) terms of the arithmetic progression (1,4,7,10,\ldots)?Class 9Sequences and ProgressionsArithmetic ProgressionLevel 51Hard