In a single throw of two dice what is the probability of obtaining a number greater than 7, if 4 appears on the first dice
the chance of getting 4 on first die are (4,1),(4,2),(4,3),(4,4),(4,5),(4,6)
number greater than 7 occurs at (4,4),(4,5),(4,6)
so required probability is 1/2
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