A box contains 19 large marbles and 10 small marbles. Each marble is either green or white. 8 of the large marbles are green, an
d 4 of the small marbles are white. If a marble is randomly selected from the box, what is the probability that it is small or white? Express your answer as a fraction or a decimal number rounded to four decimal places.
1 answer:
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Answer:
A
Step-by-step explanation:
We know that .
We also know that .
We can combine these facts to get .
So, the answer is and we're done!
<em>Note: the non-negative part or the equation comes from the fact that you assume the square root of a negative number doesn't exist. You will change this assumption later in the year, or in further years.</em>