1.

Two dice are thrown at once. What is the probability of getting face upwards with “sum equal to 4 or 5”.

Answer»

A: sum equal to 4 = {(1, 3)(2, 2)(3, 1)} 

B: sum equal to 5 = {(1,4)(2,3)(3,2)(4,1)} 

P(A ∪ B) = P(A) + P(B) = (3 + 4)/36 = 7/36



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