[Precision1C]

1. 98x x/= T,5,9,8 4*4*36 (50-3-3-4-4) =576
2. 988 4*4*3/2=24
3. 998 =24

totals 624 for each of the 3 combinations that make non- double gut straights, 98? 85? and 65?=1872.

4. T84 4*4*4=64
5. 953 =64

So the double gut possiblity adds 128 combinations for a total of 2000. Total number of flops is C(50,3)=19,600 so the odds of flopping a 8 draw straight is 10.2%.