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None, since that would imply that in 18 cases the coin did not show heads or tails!

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Q: What is the probability of flipping a coin 20 times and getting 1 tails and 1 heads?
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Related questions

What is the probability of flipping 3 coins and getting all heads or tails?

The probabilty of you flipping 3 coins and getting all heads or tails is 0.125 or 1/8.


What is the probability of flipping 4 coins and getting all heads or all tails?

The probability of getting all heads is 1/24 = 1/16 The probability of getting all tails is also 1/24 = 1/16 The probability of all heads or all tails is the sum of the two = 1/8


If you Flip four coins at once what is probability of 2 head and 3 tail?

http://wiki.answers.com/Q/If_you_Flip_four_coins_at_once_what_is_probability_of_2_head_and_3_tail" The probability of flipping four coins and getting 2 heads and 3 tails is ZERO 2 heads and 3 tails requires flipping FIVE coins.


What is the probability of flipping 5 coins and getting all tails?

The probability of getting all tails is 1/25 = 1/32


What is the theoretical probability of flipping a coin 60 times?

Theoretical is 50% Heads, 50% tails: 30-Heads, 30-Tails (theoretical)


Which comes up more when flipping a quarter Heads or tails?

Neither. Its a 50:50 probability. In the long run, heads will match tails.


What is the probability of flipping 3 dimes at once and getting two heads and a tail?

HHHHHTHTHTHHHTTTHTTTHTTTOf the 8 possibilities, 3 have 2 heads and 1 tails. So the probability is 3/8 (assuming a fair coin)


What is the probability of flipping 4 coins and getting 3 tails?

If they are fair coins, the probability is 0.25


What is the probability of flipping no heads when you flip three identical coins?

The probability of flipping one coin and getting tails is 1/2. In order to find the probability of multiple events occurring, you find the product of all the events. For 3 coins the probability of getting tails 3 times is 1/8 because .5 x .5 x .5 = .125 or 1/8.


What is the probability of flipping two coins and one landing on heads and one landing on tails?

It is 1/2.


While flipping a coin 100 times John gets 44 heads and 56 tails Enter the theoretical probability of getting a tail while flipping a perfectly balanced coin?

Every time you flip a coin it has a 50% chance of heads and a 50% chance of tails. Flipping a coin multiple times does not change that. Therefore the answer is 50%


What is the probability of rolling a prime number and flipping a coin and getting tails?

1 in 2.