Question

Ben has 100 toys. 43 of them are new, 15 are his favorites; 1 is new and favorite. Ben is going to give away all the toys that are neither new nor favorite. How many toys will he give away?

Answer 1

Answer:

43

Step-by-step explanation:

since 43 of them are new, and 15 of them are his favorite, that means that 43+15 58 are new and favorite. In addition, we have one that is both, and since

P(A or B)=P(A)+P(B)-P(A and B)

we have 43+15-1= 57.

100-57 is 43.