Escape RoomRiddle #1402
The four dials must describe themselves: the first digit tells how many 0s are in the code, the second how many 1s, the third how many 2s, and the fourth how many 3s. Two codes do this, but this lock's code has an odd number in it. What is it?
Hint: The digits must add up to 4, since together they count all four digits.
Answer
1210
Only 1210 and 2020 describe themselves. 1210 has one 0, two 1s, one 2 and no 3s. 2020 is all even, so the code is 1210.
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