Using a calculator, plug numbers into the formula: nCk/2^n
4C3/2^4 = 4/16 = 1/4
Pascal's triangle can be used, if you are familiar with that (makes things much easier for a .5 probability scenario. See related link
50%
The probability is 1/4
50/50
Coins do not have numbers, there is only the probability of heads or tails.
The probability of the coin coming up heads each time is 1/8; likewise for 3 tails. The probability of getting 2 heads and 1 tail (in any order) or 2 tails and 1 head, is 3/8. There are lots of other events whose probability can be calculated when a coin is tossed 3 times, but the question doesn't specify what event is to have its probability calculated.
50%
The probability is 1/4
1/64
The probability is 0.5The probability is 0.5The probability is 0.5The probability is 0.5
50/50
The probability of tossing a coin twice and getting tails both times is 1 in 4, or 25%. If you have already tossed a coin and had it land on tails, the probability that it will land on tails again the next time you toss it is 50%.
It is 0.25
The probability of getting two tails in the first two is 1/4. And it does not matter how many more times the coins are tossed after the first two tosses.
Coins do not have numbers, there is only the probability of heads or tails.
25% or 0.25 Probability of one tail is 0.50. Since two tails are independent events, the probability is 0.5 x 0.5 = 0.25
The probability to get tails once is 1/2 (for a fair coin) The probability to get tails twice = the probability to get it once x the probability to get it a second time The probability to get tails 4 times in a row is (1/2)4=1/16 The probability to get tails n times in a row is (1/2)n=1/2n The same thing is also true for heads (same probability: 1/2 each time)
The answer depends on how many coins were tossed.