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i hate these coin questions :(

The answer is 0.273... so not 15/64... but I'm not sure how to arrive at the answer.

which totals to 0.273, indeed

okay, what i punched in was the number of ways, you can get heads in the first four tosses, my bad

and i got the sample space wrong too, pellete

0 1 2 3 4 5 6 7 8
1 8 28 56 70 56 28 8 1
if my pascal is right ...
70 * .5^4 * .5^4 = 35/128 = .2734

thanks :)

just to practice the latex :)
\[{n \choose r}\ p^r\ q^r\]
\[{8 \choose 4}\ .5^4\ .5^4\]

Hmmm. I'll have to double check that! Sorry..

It still doesn't add up...

ok, that's strange, it works here... I don't know how to help you further than..