Calculation: 1 / 3 minus 1 / 2 + 1 / 4 minus 1 / 3 + 1 / 5 minus 1 / 4 +... + 1 / 100 minus 1 / 99

Original formula = - 1 / 2 + 1 / 3-1 / 3 + 1 / 4-1 / 4 + 1 / 5-1 / 5 + 1 / 6 +... - 1 / 99 + 1 / 100
=1/100-1/2
=-49/100

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