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(1) A bag contains 4 balls. Two balls are drawn at random and are found to be white. What is the probability that all balls are white? ...
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One of my old doubts ; still unsolved.... *Image* (P.S. I don't have the answer) ...
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Find the sum of this infinite series \sum_{0\leq i\neq j\leq \infty}{\left(3^{-i}\times 3^{-j})} ...