A box contains only blue pens and black pens. There are 8 blue pens and 4 black pens.
Chloe takes at random a pen from the box. She does not put the pen back in the box.
Chloe takes at random a second pen from the box.
a.[2]
Complete the probability tree diagram.
b.[2]
Work out the probability that Chloe takes two pens of the same colour.
Conditional Probability Questions
Practise Edexcel GCSE Maths Conditional Probability with exam-style questions for Foundation and Higher tier. 28 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.