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I assumed this was the same as modelling P(X1=...=X=4=0, X5=1) = (1-p)^4 (p)

Where 0 = tails and 1= heads

So the likelihood function would be L(p) = (1-p)^4(p)

But I don't think this takes into consideration the fact that the coin is being tossed just until it lands head up - any input would be greatly appreciated :)