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1/3 -2/3 2n - 2n -------------- = ? -2/3 2n
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n - 1
1/3 -2/3 2n - 2n = -------------- -2/3 2n 1/3 -2/3 2n 2n = ------ - ------- -2/3 -2/3 2n 2n 1/3 + 2/3 -2/3 + 2/3 = n - n 3/3 0 = n - n 1 0 = n - n = n - 1
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