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Earn +20 ptsQ: Two digit numbers contain exactly one 4?
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How many 5 digit numbers have exactly two sevens in them?
Excluding numbers with leading 0s, there are 6804 such numbers.
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 two digit prime numbers are there?
There are 21 two-digit prime numbers.
How many four digit numbers are there which have exactly the same two digits.?
Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.
What two numbers represent a binary digit?
The only two numbers that represent a binary digit are 0 and 1
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