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Earn +20 ptsQ: How many 5 digit numbers have exactly two sevens in them?
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How many 3-digit numbers have exactly two sevens in them?
Leaving out 077, since it is actually a two digit number, the answer is 35.
How many sevens are there in 497?
There are exactly 71 of them.
How many 3-digit numbers have exactly 2 digits that are the same?
1
How many 3 digit numbers have 2 of the same digits?
Exactly 2: 243 of them.
How many 10 digit combinations are there for the numbers 0 through 9?
Exactly 3,628,800, or 10!.
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