Answer :

(198)3 =(200 – 2)3


(200 – 2)3 =(200)3 – [ 3 ×(200)2 × 2 ] + [ 3 ×(200)×(2)2 ] –(2)3


{ (a – b)3 = a3 – 3a2b + 3ab2 – b3 }


= 8000000 – 240000 + 2400 – 8


= 7762392


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