Answer:
10 people bought both strawberry and peach cones
Step-by-step explanation:
Given that there are two types of ice cream cones - strawberry and peach. You and 24 of your closest friends are going to buy ice cream cones.
Assuming that each one had atleast one ice cream we get
[tex]n(AUB) =24+1 =25[/tex]
A - no of people bought straw berry
B - no of people bought peach cones
n(A) = 15 and n(B) =20
Hence we have
[tex]n(AUB)=n(A)+n(B)-n(AB)\\25= 15+20-n(AB)\\n(AB) = 10[/tex]
10 people bought both strawberry and peach cones
