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22. number of red tens = 2
number of black 6's = 2
number of your event = 4
prob (red10 or black 6) = 4/52
prob (NOT(red10 or black6)) = 48/52
odds in favour of (red10 or black6) = (4/52) / (48/52)
= 1 : 12
which is D
24. odds in favour of storm = 4 : 1
so prob of storm is 4/5
prob of QQ = (4/52)(3/51) = 1/221
prob not QQ = 220/221
odds in favour of QQ = (1/221) / (220/221)
= 1 : 220
which is A
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