Help in counting paths

help
1

Sorry for Spamming in the postsdfsfsdfsdfsdfsddsfssnf

2

Its just 2\binom{a-1}{b}

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3

Isn’t that correct?

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4

Probably, but he’s posted an image, and sometimes it is from an ongoing contest. The way it’s written is weird and he’s posted another question a few minutes ago.

5

found it: Problem - 101498D - Codeforces

Not sure why he posted an image though

6

I didn’t knew how to post the link so I had posted the image

7

You can just copy/paste it.

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