find the value of ( 1002) cube using suitable Identiy
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(1002)^3=(1000+2)^3
(1002)^3=(1000)^3+(2)^3+3×1000×2×(1000+2)
(1002)^3=1000000000+8+6000×1002
(1002)^3=1000000000+8+6012000=1006012008
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