Venn and tree diagrams
 

Venn and tree diagrams problem 1


A box contains 10 counters. The counters are either red or green. The ratio red counters : green counters = 1 : 4. Shareen picks a counter at random, notes its colour and puts it back in the box. She then picks a second counter at random.




  • Complete the tree diagram.


  • Find the probability that both counters are green.


 

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