If three events A, B and C are mutually independent, then
The Venn diagram starts as
This includes the probabilityso subtract this to obtain the diagram below.
Similarly for A and C and B and c respectively.
Subtractto get 0.036
Subtractto get 0.056,
Finally for A, B and C respectively
finally, the outisde, is 1-(0.144+0.224+0.084+0.096+0.024+0.036)=0.336 to give the completed diagram: