SOLUTION: How many three digit numbers can be formed from the set 0-9 if repetitions are allowed and the number must be a)even b)divisible by 5? c) divisible by 10?

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Question 1116179: How many three digit numbers can be formed from the set 0-9 if repetitions are allowed and the number must be
a)even
b)divisible by 5?
c) divisible by 10?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
There are 1000 three digit numbers from 000 to 999.
Half are even, half are odd.
a) 500.
.
.
.
5,10,15,...,990,995
995%2F5=199
b) 199
.
.
.
From the previous list, remove the first number and every other number,
10,20,...,990
c) 99