[Festus22]

Just another angle on this and these are approximations:

3-Flush Board
Kx beat by Ax 6.2% of the time
Qx beat by Ax or Kx 11.5% of the time
Jx beat by Ax, Kx or Qx 15.9% of the time

Basically, the formula amounts to subtracting 0.9% from each previous result and adding that number to the total. So for 8x to lose = 6.2 + 5.3 + 4.4 + 3.5 + 2.6 = 22%.

Since there's already 5 of the suit out (your 2 + the board's 3), there's only 2 more possibilities to go meaning that 3-2s wins 74.5% of the time on a 3-flush board.