The short cut method of (68)^3
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68³ = (70-2)³ {(a-b)³ = a³-3a²b+3ab²-b³}
(70-2)³ = 70³ - 3* 70² * 2 + 3*70*2² - 2³
(70-2)³ = 343000 - 29400 + 840 - 8
(70-2)³ = 314432
68³ = 314432
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