8.2 the decimal is 8.124 but you just round
Considering that it is allowed to repeat the digits in the three-digit code, we have,
10 x 10 x 10 ways
which is equal to 1000 ways.
For the scenario that only even numbers without repetition can be included, we have,
5 x 3 x 1 ways
which is equal to 15 ways.
The probability is therefore 15/1000 or 3/200.
Here's a graph of the 2 equations you provided. Hope this helps!
A coefficient is the number that goes with the letter such as 6x were 6 is the coefficient.
