Anna and Ben live at opposite corners of a 2 by n block.

If Anna only moves right or up or down, and isn't allowed to retrace her steps, how many ways does she have to get to Ben?

How many ways can you find to prove your guess?

Anna and Ben live at opposite corners of a 2 by n block.

If Anna only moves right or up or down, and isn't allowed to retrace her steps, how many ways does she have to get to Ben?

How many ways can you find to prove your guess?

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TopNewest2^(n-1) – Mobin Mithun · 2 years ago

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– Raven Herd · 1 year, 7 months ago

can you explain ?Log in to reply