Probability of the Union of 4 events

What is the probability of the union of 4 events? The events are:

E- hitting an even number on a dartboard= .0249

D- hitting a double P=.1049

N- hitting a number higher than 10 P=.0249

B- hitting a bullseye P= .007

I came up with:

1. P(E)+P(D)+P(N)+P(B) **-**

2. [P (E D) + P(E N) +P (E B) + P(D N) + P(D B +[P(N B] **+**

3. P(E D N)]+ P(D N B)] **-**

4. P( E D N B)

I'm basically asking if I got the formula right for the probability of the union of 4 events.

Any help is appreciated :)