The number of ways that you obtain a 2 on the black die is 6 ways.
If two fair dice(one black die and one white die) are rolled, in order to know the number of ways a 2 can be obtained on the black die, we will use the method of combination.
- Combination has to do with selection. Hence the way a 2 can be obtained on a black die is 6C1
- Note that a die has 6 faces and a 2 can only occur once in a toss.
Get the required number of ways:

Hence the number of ways that you obtain a 2 on the black die is 6 ways.
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It is b because the line intersects at (0,4) and the slope decreases by 2
There is approximately 1 solution for this equation