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I seem to be getting \(\frac{3}{8}\), so \(11\), but it is wrong.

@shubhamsrg I see that you have solved this problem.

how come denominator = 8 ??

its given that at least one flip results in a head

so, denominator = 8 - [TTT] = 7

lol, oh yes.

so, 3/7 ...and 10

yeah its correct

Of course it is. :-)

How did you get to know that I solved it ?

@shubhamsrg You were on the list. :-)

I got it right :-)

which site ?

The cosine rule one ?

brilliant.org

I am posting that question on maths section, unable to do it till now.

Cosine rule? There was no such problem.