The Student Room Group

Probability

There are three different types of sandwiches on a shelf.

There are

4 egg sandwiches, 5 cheese sandwiches and 2 ham sandwiches.

Erin takes at random 2 of these sandwiches.

Work out the probability that she takes 2 different types of sandwiches.
Don't have any paper to hand to work it out but I would use a tree diagram to work it out if that helps

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