Q. 7 C4.8( 4 Votes )

Find the value us

Answer :

(999)3 = (1000 – 1)3

Using Identity:


(x – y)3 = x3 – y3 – 3x2y + 3y2x


(999)3 = 10003 – 13 – 3(1000)2(1) + 3(1)2(1000)


= 1000000000 – 1 – 3000000 + 3000


= 997002999


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