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i.e.

If you flip a coin 3 times, what are the chances that at least 2 times will turn up heads?

This example would be simple enough to map out all of the occurrences and find out which proportion meet those criteria, but the examples i will need to work with are too complex to do so.

I tried to find the formula online but didnt know the name and couldnt describe it in such a way that a google search yielded results.

Thanks!