There are 5 boys and 7 girls.4 person are selected find probability all boys or girls?

1 Answer
GPLuffy
Jun 26, 2018

#4/33#

Explanation:

When only boys are selected, it will be 5C4, which is 5.
When only girls are selected, it will be 7C4, which is 35.

In total, without restriction, is 11C4, which is 330.

Putting it in fraction form will be #40/330# which is also equals to #4/33#.

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