Here is the sample space for choosing a card from a standard deck of $52$ playing cards.

Let $A$ be the event 'getting a picture card'.
Let $B$ be the event 'getting a heart'.

Let $C$ be the event 'getting an even number'.

Calculate the probability of 'getting a heart', or $P\left(B\right)$.

Here is the sample space for choosing a card from a standard deck of $52$ playing cards.

Let $A$ be the event 'getting a picture card'.
Let $B$ be the event 'getting a heart'.

Let $C$ be the event 'getting an even number'.

Calculate $P\left(A\text{'}\right)$.

Here is the sample space for choosing a card from a standard deck of $52$ playing cards.

Let $A$ be the event 'getting a picture card'.
Let $B$ be the event 'getting a heart'.

Let $C$ be the event 'getting an even number'.

Calculate $P\left(B\text{'}\right)$.

Here is the sample space for choosing a card from a standard deck of $52$ playing cards.

Let $A$ be the event 'getting a picture card'.
Let $B$ be the event 'getting a heart'.

Let $C$ be the event 'getting an even number'.

Calculate $P\left(C\text{'}\right)$.

A bag contains $20$ clip-on bicycle bells. Some are red and some are blue. A bell is chosen at random from the bag. $R$  is the event 'picking a red bell'.
If $\mathrm{P}\left(R\text{'}\right)=\frac{1}{4}$, find the number of red bicycle bells in the bag.

A box contains three brand-$A$ batteries and seven brand-$B$ batteries.
The probability that a brand-$A$ battery is faulty is $0.3$, and the probability that a brand-$B$ battery is faulty is $0.4$.

Copy and complete the tree diagram to show all the probabilities.

Two fair coins are tossed.
Draw a tree diagram to represent the possible outcomes.

Two fair coins are tossed.
Calculate the probability that both coins show Heads.

James wants to find the probability of rolling two sixes on two fair dice.
He starts to draw this tree diagram.

Copy and complete the tree diagram.
Calculate the probability of rolling two sixes.