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The probability of getting heads on a fair coin toss is 1/2.
Since Olive has 3 coins and she is tossing each coin one time, the probability of getting all heads is the product of the individual probabilities:
1/2 * 1/2 * 1/2 = 1/8
Therefore, the probability that all 3 coins land with "heads" facing up is 1/8 or 0.125.