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take advantage of the fact that 915 is 15 more than 900, while 885 is 15 less
Date Posted:
1 year ago
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When you see such questions, think of a number that's easy to evaluate. For example for 999^2,999 is hard to evaluate, however 999=1000-1.1000 and 1 are easy numbers that you can evaluate.
Date Posted:
1 year ago