Question

A bag contains 10 counters.

5 of the counters are red
3 of the counters are purple
2 of the counters are white
Sharon chooses a counter at random, records the colour, then replaces it.
Sharon then chooses a second counter at random and records the colour.
What is the probability that both counters are the same colour?

Answer 1

2:10 because there are 10 counters all together and she picks 2.