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"3) \\( - 1 \\leq a \\leq 1 \\)\nThe mean and the variance of a binomial distribution are 4 and 2 respectively. Then the\nprobability of atleast 2 successes is\n\\( \\begin{array} { l l l l } { \\text { 1) } 37 / 256 } & { \\text { 2) } 247 / 256 } & { \\text { 3) } 128 / 256 } & { \\text { 4) } 219 / 256 } \\end{array} \\)"

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