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Buying Lunch: One But Not the Other

APSTAT-ELNFFY

On any given day, the probability that Angelo will buy lunch is $0.40$ while the probability that Ben will buy lunch is $0.35$.

If the probability that neither boy will buy lunch is $0.40$, what is the probability that Ben will buy lunch but Angelo will not?

A

$-0.15$

B

$0.15$

C

$0.20$

D

$0.35$

E

$0.40$