There is a river and there are n number of steps between two banks of the 
river to cross the river.

A frog wants to cross the river with the condition that he can jump max one 
step. Find the number of ways he can cross the river?


For e.g. if there are 3 steps in between, frog can go from paths: _123_, 
_2_, _13_ so there are 3 different ways frog can cross the river (in the 
example _ is two ends of the river)


Can this question be done using Dynamic Programming ? If yes, please tell 
how .

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