solve using suitable identity (98)³
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98³ = (100-2)³
[ use (a-b)³ formula, (a-b)³ = a³ - b³ - 3a²b + 3ab²]
(100-2)³ = 100³ - 2³ - 3×100²×2 + 3×100×2²
= 1000000 - 3 - 60000 + 1200
= 941192
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