On a test of 80 problems, Bill got 75% of the problema correct. How many did he get correct?
1 answer:
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There are 6 other positions in the string, each with 26 choices. So if you fix BO as the first two letters, there are 
possible strings that you can make.
If BO is at the end of the string, you still have possible strings.
Together, then, you have
possible strings.
If BO is at the end of the string, you still have
Together, then, you have
To answer the calculation 1/2 + 3/4, you need to do the following:
1/2 + 3/4 = 2/4 + 3/4 = (2 + 3) / 4 = 5/4
This can be also written as
.
1/2 + 3/4 = 2/4 + 3/4 = (2 + 3) / 4 = 5/4
This can be also written as