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In each of the Following questions a sequence of numbers or letters that follow a definite pattern is given. Each question has a blank space. This has to befilled bythe correct answer from the four given options to complete the sequence without breaking the pattern.
$$X^2 - 2X + 1 : X^3 - 3X^2 + 3X - 1 :: X^2 - 4X + 4 : ............$$
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