Question

In a single throw of two dice, find the probability of an odd number as a sum.

Answer 1

The number of possible outcomes is 6 × 6 = 36. 

We write them as given below:  

1, 11, 21, 31, 41, 51, 6

2, 12, 22, 32, 42, 52, 6

3, 13, 23, 33, 43, 53, 6

4, 14, 24, 34, 44, 54, 6

5, 15, 25, 35, 45, 55, 6

6, 16, 26, 36, 46, 56, 6

n(S) = 36

E = Event of getting an odd number as a sum

= {(1, 2),(1, 4),(1, 6),(2, 1),(2, 3),(2, 5),(3, 2),(3, 4),(3, 6),(4, 1),(4, 3),(4, 5),(5, 2),(5, 4),(5, 6)(6, 1)(6, 3)(6, 5)} 

n(E) = 18 

Probability of getting an odd number as sum = `(n(E))/(n(S)) = 18/36 = 1/2`