Posted by **Tommy** on Sunday, October 30, 2011 at 10:40pm.

What is the probability that a fair coin lands Heads 4 times out of 5 flips? Out of bit strings of length ten, what is the probability that the bit string begins and ends with 0? What if the bit string has more 0s than 1s? and, what if the bit string has the sum of its digits equal to seven?

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