Four fair coins are tossed. The probability of either one head or two heads showing up

Answer 1

The probability of getting one head or two heads can be calculated by summing the probabilities of each individual outcome.

The possible outcomes for getting one head are:

- HHHH
- THHH
- HTHH
- HHTH
- HHHT

The possible outcomes for getting two heads are:

- HTHH
- HHTH
- HHHT
- HTTH
- THHH
- TTHH
- HHTT
- HTHT
- THHT
- HTTH

Therefore, there are a total of 15 outcomes that result in either one head or two heads.

Since there are 2^4 = 16 total possible outcomes when flipping four coins, the probability of getting either one head or two heads is 15/16.