Please help , I only need the second part of the question

Question

Betty picks 4 random marbles from a bag containing 3 white , 4 yellow and 5 blue marbles
The probability that exactly 1 of the 4 marbles drawn is blue is (0.3535) .

The probability that at least 1 of the 4 marbles drawn is white is (0.2181) (0.2546) (0.5090) (0.7455) . Please help! Thank you :)

Answer 1

#1.
I agree with your first answer of .3535

#2.
at least 1 of the 4 marbles drawn is white
---> what you don't want is all non-white.

prob(none are white) = (9/12)(8/11)(7/10)(6/9)
= 14/55
prob(at least one white) = 1 - 14/55
= 41/55
= .7455 correct to 4 decimals

I have no idea what those 4 decimals in brackets represent, one of them is my answer.