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On subtracting first 25 odd numbers from first 30 odd numbers we get _____(a) 5^2(b) 375(c) 5(d) 275I had been asked this question in unit test.The origin of the question is Patterns in Squares of Numbers topic in division Squares and Square Roots of Mathematics – Class 8

Answer»

Correct option is (c) 5

To ELABORATE: If we add the FIRST 25 odd numbers, we get 625 (i.e.25^2) and when we add first 30 odd numbers, we get 900 (i.e.30^2). When we calculate the DIFFERENCE between the two, we get 275. Hence 275 is the correct answer and the others are incorrect.



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