HELP ME MATHS GENIUSUSES?

Science & Mathematics by Anonymous 2018-06-26 22:03:13

Social Science

3 answers

Steve has 8 biscuits in a tin. There are 3 digestive and 5 chocolate biscuits. Steve takes two biscuits at random from the tin. Work out the probability that he chooses two different types of biscuits.

Anonymous

(3/8)(5/7) + (5/8)(3/7) = 30/56 = 15/28
Anonymous

. C(5,1) * C(3,1) / C(8,2) = 15/28 or using a tree diagram
Anonymous

P(2 different biscuits)= 3C1*5C1/8C2= 15/28