Crosses and Squares
Two crosses can be put in three squares in three different ways, as follows.
In how many different ways can you put three crosses in five squares?
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If we think of it we would need to do 5 choose 3 as there are 5 squares and you need to choose three crosses. 5 choose three is simply (5 ⨉ 4 ⨉ 3) / (1 ⨉ 2 ⨉ 3) which is 10.
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