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Q: When two coins are tossed simultaneously what is the probability of obtaining at most one head?

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The answer depends on the experiment: how many coins are tossed, how often, how many dice are rolled, how often.

Coins do not have numbers, there is only the probability of heads or tails.

1/4 if they are tossed only once.

1/2 or 50% (1/8 prob of 0H + 3/8 prob of 1H)

The answer depends on how many coins were tossed.

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3/8

(0.5)n

It is 1/2^7 = 1/128.

The answer depends on the experiment: how many coins are tossed, how often, how many dice are rolled, how often.

The probability is 1/16.

The probability of getting two tails in the first two is 1/4. And it does not matter how many more times the coins are tossed after the first two tosses.

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

Coins do not have numbers, there is only the probability of heads or tails.

255/256 (complement formula)

1/4 if they are tossed only once.

50/50

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

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