Switch Selected Value for no selected value

[Cheezeduckies]

So I have a working switch statement for a selected value, with two options, but I was wondering if I could get a third switch statement working for if neither option is selected.

the Slicer has option A and B, so I want my formula to work for A and B and neither option pressed. 

Currently I have: 

SWITCH(SELECTEDVALUE(Choice),"A",SUM(X),"B",sum(Y),"",SUM(Z))

so I have tried with "" but when I press no options on the slicer, nothing appears in the graph, can anyone please advise?

[ravsha85 · Accepted solution]

Hi @Cheezeduckies  could you please try this

SWITCH(
TRUE(),
SELECTEDVALUE(Choice) = "A", SUM(X),
SELECTEDVALUE(Choice) = "B", SUM(Y),
TRUE(), SUM(Z)
)

[juleshorton]

This syntax works better than most I've tried, but mine doesn't switch to the last option when nothing is selected?

[Cheezeduckies]

That Worked! Thanks So Much.