Display Count in Pie Chart based on Condition

[VictoriaTomaz]

Hello, I have some sample data here:

ID	Class
1	A
1	B
1	C
2	A
3	A
3	B
4	A
4	C

I'm trying to create a pie chart that displays a count of "Class" but I only want it to display the count where ID has both A & B present. So based on the data above, ID 1 and 3 would contribute to the count because they both have a Class which includes A and B. In the end I'm looking for my Pie Chart to look like this:

Looking for any assistance on how to write this measure properly. Thanks!

[VictoriaTomaz · Accepted solution]

In case anyone happens to stumble upon this post with the same question, this is the dax I ended up writing to help me figure out this issue:

Measure = 
VAR A = CALCULATETABLE(DISTINCT(Table[ID], Table[Class] = "A")
VAR B = CALCULATETABLE(DISTINCT(Table[ID], Table[Class] = "B")
VAR AB = INTERSECT(A, B)

RETURN
CALCULATE(

COUNTROWS(Table, Table[ID] IN AB)

And then in the visual tab of the pie chart, put this measure under "Values" and put the Class column from the table under "Legend".

[Daniel29195]

@VictoriaTomaz 

the requirement is confusing ( at least for me).

can you please explain the logic  ? like  in class A on the pie chart,  how do you get the 40% ? 

another question related, 

if id is in A and B , should i count it in A , and in B ? 
what about C class ? 

best regards

[VictoriaTomaz]

Sorry for the Confusion, Instead of doing percentages, I should of done it by counts instead kind of like this:

So A & B are 2 from ID's 1 and 3 adding to the count since they both have Class A and B in the table.

The reason C shows up is from ID 1, since it meets the reqirement of having both A & B, I also want it to count any other Classes in the chart outside of just A & B, hence why C shows up. 

I hope that makes sense!