Question

a dice is thrown once find the probability of getting an even no.

Answer 1

thrown once
even no. 2,4,6
so probability is 3/6=1/2

Answer 2

let s be sample space
S={1,2,3,4,5,6}
n(S)=6

let A be event such that A is an even number
A={2,4,6}
n(A)=3

p(A)=nA/nS
=
$\frac{3}{6} \\ = \frac{1}{2}$