Question

Consider two fair, FOUR sided dice, with faces labeled 1, 2, 3, 4. Compute the probability...

Consider two fair, FOUR sided dice, with faces labeled 1, 2, 3, 4. Compute the probability of rolling

a) a sum of 3

b) a sum of 6

c) a sum of 9

d) the most likely sum(s) along with its probability.

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Answer #1

Total number of possible combinations = 42 = 16

a)

Sum of 3: {(1,2),(2,1)}

Required probability =

b)

Sum of 6: {(2,4),(4,2),(3,3)}

Required probability =

c)

Sum of 9: {}

Required probability =

d)

Sum of 2: {(1,1)}

Sum of 3: {(1,2),(2,1)}

Sum of 4: {(1,3),(3,1),(2,2)}

Sum of 5: {(1,4),(4,1),(2,3),(3,2)}

Sum of 6: {(2,4),(4,2),(3,3)}

Sum of 7: {(3,4),(4,3)}

Sum of 8: {(4,4)}

Since sum 5 has maximum instances, so it is the most likely sum.

P(sum is 5) =

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