A five digit number divisible by 6 is to be formed by using the digits and 8 without repetition. The total number of ways in which this can be done is
216
150
116
98
Since , the 5 digit number will be divisible by 3 if either 0 or 3 is not used. When 0 is not used. For the unit place we have 3 choices and for the remaining place we have 4 ! Choices.
When 3 is not used
In this case, if 0 is used at the unit's place, the number of choices is 4 ! If 0 is not used at the unit's place, then unit's place can be filled up in 3 ways and the remaining places in (4! - 3!) ways. Thus, required number of numbers
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