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Further Maths 9231/02/M/J/07

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Note: I do not know how to do the second and the third parts.
 

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The two situations of obtaining the sample are mutually exclusive events. The probability required is "either fist or second (not both)". So, you find the p.m.f. of the two events and add them to give the required probability. Then you sum the terms rP(r) over the range r>1 to get the expectation.
 
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