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How many 4-digit numbers can you write if you are not allowed to use any other digits except one and two?
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5 votes
How many 4-digit numbers can you write if you are not allowed to use any other digits except one and two?

User DoctorDep
by
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1 Answer

7 votes

Explanation:

ans = 1212 ,2121,2222,1111,2211,1122

User Slashlos
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