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The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Can someone me with the property questions for 12 13 and 14 plz

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c