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Gate 18

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An urn contains four balls, each ball having equal probability of being white or black. Three
black balls are added to the urn. The probability that five balls in the urn are black is-

a) 2/7 . b) 3/8 c) 1/2 d) 5/7
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GATE CSE 2011 | Question: 18
If the difference between the expectation of the square of a random variable $\left(E\left[X^2\right]\right)$ and the square of the expectation of the random variable $\left(E\left[X\right]\right)^2$ is denoted by $R$, then $R=0$ $R<0$ $R\geq 0$ $R > 0$
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