Puzzle #12: How Many Routes?

This is a puzzle from the book “Moscow Puzzles”, and the book borrowed this puzzle from one of the Mathematical Circles, a unique Russian way of making learning of Mathematics more fun through puzzles.

Here is the puzzle:

How many different routes can we draw from Point A to Point C, moving only upwards and to the right? Different routes, of course, may have portions that coincide, as in the figure.

Puzzle 12 graphic

Suggestion: For children below 12 years of age, try the same question with a 3×3 grid instead of a 4×4 grid; For below 8 years, try it with a 2×2 grid.

There are some very neat solutions to this, so please try!

P.S.: Please do not post the solutions in your comments, I am forced to keep these comments in “cold storage” until I post the solutions. You can write the answers to me directly at alokgoyal_2001@yahoo.com


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