number build!
Probability
Level
3
with 1,2,2,3,3,3 digits hownany 4* digits number we can build?
The answer is 38.
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1 solution
the solution is divided in cases. case 1: three 3, one 2 which has only 4 ways, case 2: three 3 and one 1 which has 4 ways, case3: two 3 and two 2 which has 6 ways case 4: two 3 and one 1 and one 2 which has 12 ways and lastly two 2 and one 1 and one 3 which has 12 ways. 4+4+6+12+12= 38 4-digit number