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Answers by Matt L.

Roman is right that the answer is very close to (1000000000000000000001)20 + 1/2 = (1021+1)20 + 1/2 In particular, he's right that the error is very small, much less than 1/2. But you can be even more precise using the Arithmetic Mean-Geometric Mean-Harmonic Mean (AM-GM-HM)...