If $(1 + x - 3x^2)^{2145} = a_0 + a_1x + a_2x^2 + .........$ then $a_0 - a_1 + a_2 - a_3 + ..... $ ends with

  • A

    $1$

  • B

    $3$

  • C

    $7$

  • D

    $9$

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