Combinations

If there were three drinks and three chocolate bars, list the combinations

Shop 1: Primark Shop 2: Top Shop

If you only buy one item in each shop, what are all the different combinations you could buy?

Create your own

shopping question

Lucy picks a counter at random from a bag.

What is the probability of taking a blue counter?

What is the probability of taking a purple counter?

What is the probability of taking a blue or red counter?

On your MWB write the probability that..In a class of 20 pupils, 11 have dark hair, 7 have fair hair

and 2 have red hair.A pupil is chosen at random to collect the homework.

What is the probability that theyA) Have fair hairB) Have red or dark hair

If two are picked what is the probability that they both have dark hair

The probabilities of different types of weather in Aberdeen in September are shown in the table:

Bright 0.03Cloudy 0.17Dull 0.10Fog 0.03Rain 0.37Showers 0.03Sunny xTotal 1.00

Find x.

What is the probability of either Rain or Showers?

What is the probability of getting two tails in two tosses of a coin?

H H

H T

T H

T T

What is the probability of getting three tails in three tosses of a coin?

What is the probability of scoring three 4’s on these three spinners?

x

+

144 1144

Check: Our probabilities add up to 1, so it’s looking good!

Question: What is the probability she gets two beads of the same colour?...Well, the end of which braches give us that?( )

( ) ( )25 49

144 174

14444

redP same colour

blueP and P a bluered nd

Note: I wouldn’t bother simplifying my fractions here, as it makes the adding up easier when they have the same denominator!

Now we can simplify

3772

Draw the tree for;

I throw 2 diceWhat is the probability of me getting a 6, or not

a 6On the first throwThe second throw

A bag contains 8 balls.• 5 are black and 3 are white.A ball is taken out of the bag at random and not

replaced.Another ball is taken out of the bag at random.• What is the probability that both of the balls

are the same colour?