How could you score 100 with 3 darts?

There are so many ways to do it, that it would take too long to list them all.

A few (off the top of my head) are:

BULL - BULL

T20 - D20

T19 - S11 - D16

T18 - S14 - D16

T17 - S17 - D16

T16 - S20 - D16

T15 - S15 - D20

T14 - S18 - D20

T13 - S11 - BULL

T = Treble

S = Single

D = Double

Personally, I always go for T20 - D20; if you miss the first treble 20 and hit single 20, you are left with 80, which is attainable by T16 - D16.