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nisslove
19.07.2019 •
Mathematics
How many different seven-digit phone numbers begin with 231and contain at least one 9?
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Ответ:
There are 10 digits to choose from, and there are 4 numbers, we have:
Next, let's subtract any combinations that do not contain any 9's. If the number does not have have 9's, that means there are only 9 digits to choose from, so we remove:
10000 - 6561 = 3439
The answer is 3439.
Ответ:
88.50 - 75.00 = 13.50
Now find the percentage 13.5 is of 75
13.5/75 x 100 = 18% (C)