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Question

In how many ways can the string
A∩B - A ∩ B -A
be fully parenthesized to yield an infix expression ?

a.

15

b.

14

c.

13

d.

12

Answer: (a).15

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Q. In how many ways can the string A∩B - A ∩ B -A be fully parenthesized to yield an infix expression ?

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