Question
 (108.999)² -
(102.001)²=? What approximate value should come in place of the question-mark(?) in the following question (You are not expected to calculate the exact value).Solution
 We know that a2 - b2 = (a+b)(a-b) (108.999)² - (102.001)² = (109)² - (102)² =(109+102) (109-102)= 211 x 7= 1477
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