Rose Harrison and Clara Huizink Solutions for Exercise 6: Practice 2

Calculate the probability that the sum of the scores will be a prime number when you roll a tetrahedral die and a normal (6-sided) die.

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 picture card', or $P\left(A\right)$

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 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 $P\left(C\right)$.

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.