Answer
3
Work Step by Step
$n(A)=8$
$n(B)=9$
$n(A\cup B)=14$
The question is $n(A\cap B)$
$n(A\cup B)=n(A)+n(B)-n(A\cap B)$
$14=8+9-n(A\cap B)$
$14=17-n(A\cap B)$
$n(A\cap B)=3$
3 desserts have both ingredients
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