Test Index

NDA Math Probability

Question : 60 of 100

Marks: +1, -0

Solution:

Since two dice are thrown so number of outcomes are 36.

No. of ways when sum on two faces less than

4=3

[(1,1),(1,2),(2,1)]

Hence prob of getting sum on two faces less than 4

=\frac{3}{36}=\frac{1}{12}

Thus required prob. that sum on the two faces is greater than or equal to

4=1-\frac{1}{12}=\frac{11}{12}

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