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Suppose that X is equal to either 1 or 2, with equal probability. Write down an expression for the probability that there were exactly 2 arrivalsduring the time interval [0,

2]. (Enter e for the constant e. You may use standard notation for this numerical entry even though there will be no parser below the answer box.Enter an exact answer or a numerical answer accurate to at least 3 decimal places.) Probability that there were exactly 2 arrivals during the time interval [0, 2]:

Fig: 1

Fig: 2

Fig: 3