Two fair coins were tossed once what is the probability that both coins will not fall tail
There are four possible outcomes when two fair coins are tossed:
1. Both coins land on heads (HH)
2. The first coin lands on heads and the second coin lands on tails (HT)
3. The first coin lands on tails and the second coin lands on heads (TH)
4. Both coins land on tails (TT)
Out of these four outcomes, there is only one outcome where both coins do not fall tails (HH).
Therefore, the probability that both coins will not fall tail is 1/4 or 0.25.