1

A jar contains 2 toffee and 6 mint sweets. A sweet is taken at random, its colour noted and replaced, then a second is taken. Complete the tree diagram. Use it to find the probability that both sweets are the same colour. [3]

2

A bag contains $n$ green discs and 2 white discs. Two discs are taken at random without replacement. The probability that both discs are green is $\dfrac{3}{10}$. Work out the value of $n$. [4]

3

A bag contains 5 green and 3 yellow balls. A ball is taken at random, its colour noted and replaced, then a second is taken. Complete the tree diagram. Use it to find the probability that the two balls are different colours. [3]