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Question

In a single throw of two dice, the probability of obtaining a total of 7 or 9, is:

A
49
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B
13
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C
718
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D
None of these
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Solution

The correct option is D None of these
Let the outcomes of two dice be x,y.
For the sum to be 7 , x+y=7. There are 6 possibilities.
For the sum to be 9 , x+y=9. There are 4 possibilities.
Total number of possibilities for 7 or 9 is 10.
The probability of obtaining total 7 or 9 is 1036=518.
Therefore option D is correct.

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