MCQ
Using binomial theorem, the value of $(0.999)^3$ correct to $3$ decimal places is:
  • A
    $0.999$
  • B
    $0.998$
  • $0.997$
  • D
    $0.995$

Answer

Correct option: C.
$0.997$
$ (0.999)^3=(1-0.001)^3 $
$ ={ }^3 C_0-{ }^3 C_1(0.001)+{ }^3 C_2(0.001)^2-{ }^3 C_3(0.001)^3 $
$ =1-0.003+3(0.000001)-(0.000000001) $
$ =0.997 $

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