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

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

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## Either of the four operators can be the outermost one so there are four cases …View the full answer

**Related Book For**

## Discrete Mathematics and Its Applications

**ISBN:** 978-0073383095

7th edition

**Authors:** Kenneth H. Rosen

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