A biased coin has a probability of landing on heads equal to 1/5. What is the probability of getting at least one head when the coin is tossed 3 times?

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19/125

31/125

61/125

Correct

65/125

81/125

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Explanation

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Official Explanation

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The probability of heads is P(heads) = 1/5. Therefore, the probability of tails is P(tails) = 1 - 1/5 = 4/5. To find the probability of getting at least one head in 3 tosses, we first calculate the probability of getting all tails. The…

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Comments

ShashankDec 29, 2024

Thank for sharing!!!

HiteshJan 18, 2025

thanksss

What this question tests

What it tests

Your ability to compute probabilities of single and compound events, including 'at least one' questions.

Common trap

Forgetting to use the complement for 'at least one', or treating dependent events as independent.