Question 658653: jane traveled for 2 hrs at a rate of 70 kilometers per hr and for 5 hrs at a rate of 60 kilometers per hr. What was her average speed for the 7-hr time peroid?
Answer by MathLover1(20849)   (Show Source):
You can put this solution on YOUR website! EXAMINATION has  letters, and in which ' ', ' ' and ' ', all occur twice.  , would have been fine if all letters were distinct.
So, we have , ,  ,  ,  , ( ), ( ), ( )...  distinct letters.
1.  letters selected, which are  distinct: 
2.  letters alike, and distinct (eg:  ) =
3. letters alike, and letters alike (eg:  ) = 
So answer is, .
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