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Q: When tossing 5 coins simultaneously what is the probability one will land heads up?

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Probability of no heads = (0.5)^5 = 0.03125Probability of at least one head = 1 - probability of no heads = 1 - 0.03125 = 0.96875

The probability of tossing two heads in two coins is 0.25.

the probability is 0.03125 or 3.123%

0.1222...

If they are fair coins, it is 1/16.

1/2

The conditional probability is 1/4.

The probability is 1/2^4 = 1/16

It is 3/4 or 0.75

The probability would be once in 128 attempts. You don't have to toss seven coins simultaneously. the 7 tosses just have to be independent of one another.

(0.5)n

No matter how many coins are thrown, the possibility of having AT LEAST ONE 'head' is 50%. This changes if you specify the number of 'heads' that must be shown.

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