maths

There is a bag with only red marbles and blue marbles.The probability of randomly choosing a red marble is 112.There are 84 marbles in total in the bag and each is equally likely to be chosen.Work out how many red marbles there must be.

Reply 1

DataVenia

Volunteer Team, Clearing and Applications Advisor

Original post by Sparkz1up

The probability of randomly choosing a red marble is 112.

Probability is expressed as a number between 0 (guaranteed not to occur) and 1 (guaranteed to occur), or as a fraction or percentage representing that same number. So something which is equally likely to occur and to not occur would be 0.5, 1/2 or 50%.

A probability of 112 therefore makes no sense. Is this a typo?

Reply 2

Tupmole

Seeing that you’ve posted this under Cars and Motoring, how many cars are involved, what are the dashboard lights showing, do they still run, what colour is the smoke. Have you called the fire brigade?