Couldnt find the delete button but I typically worked it out just as I posted it, so dont worry about replying, but if youre interested, here's how it's done!

right so ive picked the coin, and its flipped heads 10 times in a row. therefore there are two situations that have happened.

1) ive picked a regular coin which has just happened to flip heads 10 times in a row

OR

2) ive picked the funny coin which will always flip heads anyway

so one of those situations has definitely happened. therefore u find those probabilities which work out to the following

1) ive picked a regular coin which has just happened to flip heads 10 times in a row

=999/1000 * 1/1024 = 0.000976

2) ive picked the funny coin which will always flip heads anyway

=0.001

sum the probabilities

which gives 0.001976

then i want the probaability that i DID pick the funny coin, which was 0.001

therefore the answer is 0.001 / 0.001976

which gives 0.506179

ta da