In her pocket, Kira has 2 red marbles, 2 green marbles and 2 blue marbles that are all the same size.In her pocket, Kira has 2 red marbles, 2 green...

It is clear that any of the 6 balls are equally likey ia
draw.

The probabilty of an event is = number chances
favouarable  to the event/ total number of ways (favourable  and unfavourable to the
event)

The probabilty drawing green P(G) =
2/6.

Probability of drawing red : P(R) =
2/6

So P(G or R) = P(G)+P(R) - P(G & B) = 1/6+1/6+0
= 4/6 = 2/3.

P(G & R) = 0 , as both  colour balls
can not  happen.