Sunday, November 15, 2009

What is the probability of drawing 4 sevens in succession from 52 playing cards given cards are not replaced?

How many 7s are there total? 4





So 4/52 of the cards are 7s.





Probability of getting a 7 first is 4/52


second time is 3/51


third time is 2/50


fourth time is 1/49





(4/52) * (3/51) * (2/50) * (1/49)





Multiply them together to get: 3.69378521 × 10^-6

What is the probability of drawing 4 sevens in succession from 52 playing cards given cards are not replaced?
3 / (51 x 49 x 25 x 13)
Reply:1/13*3/51*2/50*1*49=1/270725

running shoes

No comments:

Post a Comment