Favorite fruit
persons were surveyed regarding the fruit/fruits they like. Three options were given: apple, banana and orange. According to the result of the survey:
like apple only,
like banana only,
like orange only,
like apple and banana,
like apple and orange,
like orange and banana,
like apple, banana, and orange,
do not like any of the fruit. How many like apple?
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1 solution
a
p
p
l
e
=
3
1
+
2
5
+
1
4
+
3
9
=
1
0
9