Lalo has 1500 minutes per month on his cell phone plan. How many more minutes can he use if he has already talked for 785 minute
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The probability to choose letter n is 
. After drawing letter n there left 25 letters and the probability to choose the letter w is 
. After drawing two letters n and w there left 24 letters and then the probability to choose letter b is 
. After drawing three letters n, w and b there left 23 letters, so the probability to choose letter t is 
.
Using the product rule for probabilities, you can obtain that
.
Using the product rule for probabilities, you can obtain that