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GATE ECE 2007 | Question: 1

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If $E$ denotes expectation, the variance of a random variable $X$ is given by

  1. $E\left[X^2\right]-E^2[X]$
  2. $E\left[X^2\right]+E^2[X]$
  3. $E\left[X^2\right]$
  4. $E^2[X]$
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