What is the probability of getting two heads?

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Probability of getting two heads

When flipping two fair coins, the possible outcomes are:

\[
S = \{HH, \text{HT}, \text{TH}, \text{TT}\}
\]

where:

  • H stands for Heads
  • T stands for Tails

Calculating the Probability

The probability of an event is given by:

\[
P(\text{Event}) = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}
\]

For the event of getting two heads (HH):

  • Number of favorable outcomes = 1 (only HH)
  • Total number of possible outcomes = 4

Therefore, the probability is:

\[
\boxed{P(HH) = \frac{1}{4} = 0.25 \text{ or } 25\%}
\]

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