Question

if three envelopes are selected at random without replacement, determine the probability that they all are red envelopes ... 7 envelopes in all 3 are red, 2 are blue,1 green, 1 yelllow

Answer 1

Incomplete question... how many envelopes were in the box, and how many were red or other colours

Answer 2

there are 7 envelopes 3 red 2 blue 1 green 1 yellow

Answer 3

@fortune_paul

Answer 4

The definition of probability is : possible outcomes/total outcome

so we have 3 red envelopes out of 7 possible envelopes, therefore the probability of getting the red envelope = 3/7

Answer 5

@dlewis5

Answer 6

See i thought that at first then i looked at the back of the book the answer was 1/ 35

Answer 7

@fortune_paul

Answer 8

@dlewis5
okay, the probability of picking a red the first time is : 3/7
second time : 2/6 (note that the number of red has decreased and the number of total enveloped decreased)
third time : 1/5

multiply them all out = 3/7 * 2/6 * 1/5 = 1/35