q=0.1
z=0 P=1.0000000
z=1 P=0.2045873
z=2 P=0.0509779
z=3 P=0.0131722
z=4 P=0.0034552
z=5 P=0.0009137
z=6 P=0.0002428
z=7 P=0.0000647
z=8 P=0.0000173
z=9 P=0.0000046
z=10 P=0.0000012
However, if I want to replace the top block in the chain, catching up isn't going to be enough as I need to build a longer chain for other nodes to adopt.
So would it by correct to say my probability of replacing the top block in the chain would be:
z=2 P=0.0509779
Because I need to build a chain one block longer than the number of blocks I need to catch up with. Is that correct?