Am I doing this question right so far? I need your feedback.

"A bag contains 30 poker chips of different colors. They consist of the following:

Blue Chips: 11

Green Chips: 7

Red Chips: 2

White: 10

If 4 poker chips are drawn from the bag without replacement, what is the probability of drawing one poker chip of each color?"

So far, I have:

P (BGRW) = 11/30 x 7/29 x 2/28 x 10/27

Is it right thus far or am I forgetting something?

Thankyou!