## Sunday, April 28, 2013

### a. 15               b. 9               c. 41           d. 42

The number of possible ordered binary trees is given by the formula :
1/n+1 (2n C n)
Here n is 5, 1/n+1 (2n C n) = 1/6 (10 C 5) = 42.

The formula 1/n+1 (2n C n) is bit more complex. The derivation of the formula we shall discuss in one of the future posts.

Note: nCr = n! / (r! * (n-r)!)

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