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#### karush

##### Well-known member

- Jan 31, 2012

- 2,816

I know this a very easy problem, but trying to learn the probability formula's

(a) $P(H,H,H,H)= \frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}

=\frac{4}{2}=4$

or is there another better way to do especially if the problem is much bigger and more complicated.