SOLUTION: Two identical tetrahedral are tossed once. If each face of each tetrahedral is labelled in the manner 2, 3, 4, 5. What is the probability of obtaining a sum equal to 7.

Question 759905: Two identical tetrahedral are tossed once. If each face of each tetrahedral is labelled in the manner 2, 3, 4, 5. What is the probability of obtaining a sum equal to 7.
Answer by Edwin McCravy(20062) (Show Source): You can put this solution on YOUR website!

They can fall any of these 16 ways.

(2,2) (2,3) (2,4), (2,5)

(3,2) (3,3) (3,4), (3,5)

(4,2) (4,3) (4,4), (4,5)

(5,2) (5,3) (5,4), (5,5)

The ones that have sum 7 are in red.  There are 4 of them.

So the probability is 4 out of 16 or  or .

Edwin

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