How many different ways are there from the point (a) to the point (b) ?

 

 

The solution ( request the password from rezguisami@mailcity.com )

Remark : If you have the reading password, you will receive after a second request of the writing password. At this time don't enter anything but rather hit the "Reading only" button, and the document will be open automatically in reading (only !).

Go to the second problem.

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