using suitable identity ,find the value of (999)³
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(1000-1)whole cube extend by identity (a-b)cube
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(1000-1)^3
1000^3+1^3-2*1000*1
1000000000+1*2000
1000002000
1000^3+1^3-2*1000*1
1000000000+1*2000
1000002000
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