Answer:
25/1000=0.025
Step-by-step explanation:
The chances decrease each round you add a requisite. So for the first one you have a chance of 1/10 to get a number 5. Then you have a 5/10 to get an even number the second try and another 5/10 to get another even number.
As the chances drop each round you go, you multiply them all:
1/10 . 5/10 . 5/10= 25/1000
Hope you understand it!