Odd numbers have choice
Probability
Level
2
The number of six-digit numbers, all digits of which are odd is _ _ _ _ _ __
The answer is 15625.
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1 solution
There are 5 choices for each of the digits ( 1 , 3 , 5 , 7 , 9 ) ,
hence by the multiplication rule in combinatorics, there will be 5 6 different numbers possible, that is 1 5 6 2 5