1.

ddaal

Answer»

( 999 )^3= ( 1000 - 1)^3

( a - b )^3= a^3- b^3- 3ab ( a - b )

... ( 1000 - 1 )^3= 1000^3- 1^3- 3000 ( 999 )

= 1000000000 - 1 - 2997000

= 997002999

thank you so much dear



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