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Let:
S1 = X is red
S2 = Y is not red
S3 = Z is not blue
if S1 is TRUE, then S2 will also be TRUE - this cannot be, so S1 is FALSE
Now if S2 is TRUE, then Z is Red => S3 is TRUE - this also cannot be, S2 is FALSE
This leaves S3 is TRUE
=> Z is Red or White
Since S2 is FALSE Y is Red => Z is White => X is Blue
Therefore:
X = Blue
Y = Red
Z = White