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Question

Two dice are thrown. The probability of getting a sum of less than 7 points or a double is :

A
16
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B
13
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C
23
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D
12
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Solution

The correct option is D 12
For getting a sum of less than 7 points or a double, combination is = (1,1),(1,2),(2,1),(1,3),(3,1),(2,2),(1,4),(4,1),(2,3),(3,2),(1,5),(5,1),(2,4),(4,2),(3,3),(4,4),(5,5),(6,6)
Total ways = 18
Probability = 18/36 = 1/2

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