1 in 2, or 0.5
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Theoretical probability is the number of ways something can occur divided by the total number of outcomes. So, the theoretical probability of throwing a coin and it landing on heads is 1/2 or 0.5 or 50%.
25%
The probability of a fair coin landing on heads or tails is even, i.e. 50/50.
1/2 * 1/2 = 1/4 1/2= probability of landing an even number 1/2 = probability of landing a heads
The answer is 1/2 , assuming the coin is fair.