The GMAT Math Pro logo is stuck on the highest ledge of a nine-story building and must climb down to the single ledge on the bottom row to get to safety. Each move he makes must be to a ledge on the level immediately below him and to the immediate right or left of the ledge on which hes currently standing. If all available ledges are pictured in the above diagram, how many paths can he take to get to safety?
A. 18
B. 70
C. 128
D. 256
E. 512
Are You Up For the Challenge: 700 Level Questions
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GMATLogoLedges.jpg