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.
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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(20060) (Show Source):
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
