Odds of Multiple Opponents Hitting Flop

Hi, 1st post but lurked for a while, thanks to all the regulars for some great information.

My question concerns 'hitting flops' - current understanding is that 2/3rd flops are missed by any individual... how does this increase with multiple opponents? often 2,3,4 or even more seeing a flop so how does this % increase with each player.

Obviously common cards and paired hands would have an effect here... maybe a good starting point would be each player having random cards with none in common and go from there...

Thanks!

Hollandicus