Selective Entry Thread 2021 (Lockdown) (5 Viewers)

jimmysmith560

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i think that person who wrote the solution interpreted the q wrong. it’s asking for how many stable 3 digit numbers there are not necessarily like in ‘78247’ if yk what i mean
It seems you are correct. The correct answer appears to be 252. It is also stated that numbers should not be double-counted.
 

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