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i have not done S1. i will use my o level knowledge to do it.
(i) if anyone wins the first one, the probability of the same person winning the game is clearly 1/2
(ii) there's only one way this can happen. the one who wins the first one loses the second and third. so it is 1/2 * 1/2 = 1/4
(iii) i guess there is again only one possibility: first he wins, second loses, third wins and fourth wins. so 1/2 * 1/2 * 1/2 = 1/8
(iv) well win lose win lose win is the only possibility as any other way the game will end just there. it will be by sequence (1/2)^4
there is no way the game can go on after 5 games.
the cost will be i guess 18/100.
Hey, I appreciate your effort! But S1 knowledge is required for this question. anyway, thanks