When two fair six-sided die are rolled, what is the probability that the sum of the square of the numbers rolled is a multiple of 4?
*Give your answer as a fraction in simplest form
There are $n$ cards numbered $1,2,\ldots \;n$ where $n\ge 3$.
Three cards are drawn one after another without replacement. Let the numbers on these cards be $a, b,$ and $c$ repsectively. Find the probability that $a \lt b \lt c$.
*Give your answer as a fraction in simplest form
Weather forecaster $A$ is correct about their predictions $70\%$ of the time and
weather forecaster $B$ is correct about their predictions $60\%$ of the time. These probabilities are independent of each other.
$A$ claims “it will rain tomorrow” and $B$ claims “it will not rain tomorrow”.
What is the probability that it rains tomorrow?
*Give your answer as a fraction in simplest form
Deck A contains five cards numbered from $0$ to $4$.
Deck B contains ten cards numbered from $0$ to $9$.
One card from deck A and two cards from deck B are drawn without replacement.
Find the probability that the product of the numbers on these three cards equals zero.
*Give your answer as a fraction in simplest form
A box contains 9 coins.
8 of the coins are fair coins with one side heads and one side tails. 1 of the coins is unfair and has heads on both sides.
A coin is randomly chosen and flipped 4 times, getting all heads. It is unknown whether the coin was a fair or the unfair coin.
If this coin is flipped again, find the probability that it will be heads.
*Give your answer as a fraction in simplest form
A bag contains $2$ red balls and $1$ blue ball. A ball is randomly pulled out of the bag.
If it is red, it is replaced with a blue ball and put back in the bag.
If it is blue, it is replaced with a red ball and put back in the bag.
After repeating this four times, what is the probability that the $3$ balls in the bag are all blue?
*Give your answer as a fraction in simplest form
There is a box full of gold, silver and bronze coins. $3$ coins are chosen at random.
There is a bag full of gold and silver rings. $2$ rings are chosen at random.
If it is known that exactly $3$ of the $5$ items chosen are gold, find the probability that exactly two types of coins were chosen.
*Give your answer as a fraction in simplest form