**Hi..i have a doubt in permutation and combination..
i already know permutation is an a method of arrangement of a set of n objects in a given order that means in permutation order of objects is important .
combination is a method of total ways of doing a particular task ..here order of objects in the selection does not matter.
But if a question is given as follows how to identify whether this question is of permutation or combination.
How many integers between 100 and 999 consist of distinct even digits.
I have done as follows The total no of even digits are(0,2,4,6,8)=5 and a number is identified as even by its last digit.
As first digit can not be 0 so it can take any of the 9 digits(1-10) Second digit can take 8 3rd digit can take 5 so my answer came out to be 9*8*5.
is it correct**