whats the odds .. ???

Hi all... please can someone help...

If i have a games board with 20 tiles, 8 of them are losing tiles and 12 are winning tiles... to win I need to pick all 12 winners..? What is the probability and odds of guessing all correct winning tiles..? I can calculate for each individual event... like I have 60% chance of picking the first tile correctly... And 55% for the next and so on... but what are the odds of getting all 12 right without picking a loser..??

Help is hugely appreciated... :-)

if you have to pick all 12 good tiles in 12 tries, it's easy....


12/20 * 11/19 * 10/18 * 9/17 * 8/16 * 7/15 * 6/14 * 5/13 * 4/12 * 3/11 * 2/10 * 1/9 =

1/125,970

Wow .. !! your math looks right ( but what do i know ..? ) but it seems pretty far out there at 1 in 125,970 ..? i cant make that math work .. ? what am i doing wrong with that formula ..???

well it's extremely hard to pick all 12 in a row, that's why.

For the math -- Wolfram

even bigger wow ..

Stupid question .. but what would 10 in a row be ? given everything else was the same ..?? 12 correct tiles, 8 losers ..20 in total .. but 10 correct pickes ..?

Quote: montyace

even bigger wow ..

Stupid question .. but what would 10 in a row be ? given everything else was the same ..?? 12 correct tiles, 8 losers ..20 in total .. but 10 correct pickes ..?

12/20 * 11/19 * 10/18 * 9/17 * 8/16 * 7/15 * 6/14 * 5/13 * 4/12 * 3/11 = 1/2800

Thanks very much ..