I believe it's 12 because 5*16=80. So, then you would subtract 4 from 16 and gat 12.
The probability of drawing a black marble is 7/31 or .226 or 22.581%. To find the probability of these type of questions, add all together to get 31, then since there are 7 black marbles the probability would be 7/31.
Can you take a closer pic of this
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Step-by-step explanation:
