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What 5 digit number am I thinking of. It has two prime digits. Digit 3 is the highest digit. Digit 2 is lowest digit. Digit 1 is higher than the sum of

digits 4 and 5. Digit 5 is half of digit 4. Digit 1 is one smaller than digit 3. Digit 5 is between digit 2 and digit 1 There are no duplicates and the digit 0 doesn't appear. Don't forget that 1 isn't prime.

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So the answer
Answer: 71842.
The number can be represented as:
_ _ _ _ _
Since digit 5 is half of digit 4 we have four possibilities:
_ _ _ 2 1
_ _ _ 4 2
_ _ _ 6 3
_ _ _ 8 4
But since digit 1 is higher than the sum of digit 4 and digit 5 we can eliminate two possibilities leaving:
_ _ _ 2 1
_ _ _ 4 2
Since digit 5 is between digit 2 and digit 1, we can eliminate _ _ _ 2 1, leaving:
_ _ _ 4 2
Since digit 1 must be higher than the sum of digit 4 and digit 5 we have three possibilities:
7 _ _ 4 2
8 _ _ 4 2
9 _ _ 4 2
But digit 1 is 1 smaller than digit 3 we can eliminate 9 _ _ 4 2, leaving
7 _ 8 4 2
8 _ 9 4 2
Since digit 2 is the lowest number, it must be 1:
7 1 8 4 2
8 1 9 4 2
The answer has exactly 2 prime digits, which only leaves
7 1 8 4 2.