$$\text { If } \mathrm { P } ( A ) = 0.4 \text { and } \mathrm { P } ( B ) = 0.6$$

True/False

$$\text { If } \mathrm { P } ( A ) = 0.4 \text { and } \mathrm { P } ( B ) = 0.6$$ , then A and B must be collectively exhaustive.