There are 5 red counters and y y\,y blue counters in a bag.
Imogen takes a counter from the bag at random.
She puts the counter back into the bag.
Imogen then takes another counter at random from the bag.
The probability that the first counter Imogen takes is red and the second counter Imogen takes is red is 19\displaystyle \frac{1}{9}91
Work how many blue counters are in the bag.
Practise CIE IGCSE Maths Probability Equation Questions with exam-style questions for Core and Extended tier. 7 questions, matched to the CIE IGCSE Maths (0580) specification and written in Paper 1 and Paper 3 (Core) or Paper 2 and Paper 4 (Extended) 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.