Answer:
The probability when rolling a regular six-sided dice that the score is an odd number is three-sixths or three out of six.
For any problem like this you want to list the full set of possibilities, in this case: {1,2,3,4,5,6}. Then list the desired elements that form the subset of values your question requires, in this case: the odd numbers {1,3,5}. Count ’em up, and divide the subset count by the total count:
Prob(value in subset)=
Number of Elements in SubsetTotal/ Number of Elements
N(A)=3
N(S)=6
hence probability is 3/6 = 1/2
