Probability

Question

If you toss four coins, what is the probability that you will get exactly 1 or 4 heads? Calculate the Probability.

Answer 1

There are 4 ways to get exactly 1 'head', i.e. it could appear on the first, second, third or 4th try.

This probability is 4(½)⁴ which equals ¼.

 

The probability of getting all 4 heads is (½)⁴ which equals one sixteenth.

 

The sum of these two mutually exclusive probabilities is 5/16.