3x + 4y=25 4x - 4y=-4
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There are 8 possible outcomes so that means the probability will have a denominator of 8.
Now, there is only one of the eight outcomes that has zero tails.
Therefore the probability of getting zero tails after tossing a fair coin three times in succession is
Now, there is only one of the eight outcomes that has zero tails.
Therefore the probability of getting zero tails after tossing a fair coin three times in succession is