How many distinguished permutations of the set of letters, {a,b,c,c, d, d, d} can be formed....

 

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How many distinguished permutations of the set of letters, {a,b,c,c, d, d, d} can be formed. Problem 4: A photon arrives at a photodetector at time t, where t is a random variable time in the interval 0<t < 20 ps. All times are equally likely. 1. Find P[9 ps <t < 12 ps] 2. Find P[9 ps <t < 12 ps | t > 8 ps]. How many distinguished permutations of the set of letters, {a,b,c,c, d, d, d} can be formed. Problem 4: A photon arrives at a photodetector at time t, where t is a random variable time in the interval 0<t < 20 ps. All times are equally likely. 1. Find P[9 ps <t < 12 ps] 2. Find P[9 ps <t < 12 ps | t > 8 ps].