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# Probability question watch

1. I'm struggling with the attached question, for the first part all I can think to do is

P1= N(1-a)(1-b)+a

So add the probability that they both miss in succession and then add the probability that A hits B at the end. But this is not what the answer is unfortunately, can someone please tell me how to do this question thanks!
2. (Original post by Davelittle)
...
You seem to understand the condition required for A to win but your probability is, as you've pointed out, wrong.

Consider the probabilities for n=0,1,2,... where n is the number of successive misses. Hopefully, you'll be able to construct a correct probability from that.
3. This is A level question? Made me think a bit funnily enough, even though the answer is not difficult.
4. (Original post by hassassin04)
This is A level question? Made me think a bit funnily enough, even though the answer is not difficult.
No it's from a university level example sheet but this term we are just reviewing A level and allowing people who haven't done stats (me) and further maths (me again) at A level to catch up so everyone is in the same boat!
5. Well, you need to sum up all probabilities that make the duellist A win.. try to list those cases and associated probabilities where he wins.

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Updated: December 29, 2014
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