permusi combi!!!
Probability
Level
2
How many 3 digit number are there, with distinct digit,with each digit odd??
The answer is 60.
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1 solution
Odd set are {1,3,5,7,9}
5:choose first one digit from set. 4:choose second digit from remaining set. 3:choose third digit from remaining set. Then for distant digit is 5x4x3=60