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IMPORTANT FORMULAE FOR COMPETITIVE EXAMS - Amazon …

= n(n + 1) 4. Sum of the squares of first n natural numbers = n(n 1)(2n 1) 6 5. Sum of the cubes of first n natural numbers = n(n 1) 2 2 PERCENTAGES 1. Two successive percentage changes of a% and b% is an effective change of ab a+b+ 100 %. 2. If A is r% more/less than B, B is 100 r % 100 r less/more than A. INTEREST 1. P = Principal, A = Amount ...

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