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Do a binomial expansion of (T + H)400.

Evaluate the 221st term for H= 1/2 and T = 1/2 and you have the answer.

There is some short cut to get that term quickly, but I've forgotten it.

Q: What is the probability to have exactly 220 heads when you flip 400 coins?

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There is a 1/8 chance to land three heads.

1/2 apex It does not matter what each prior flip's result was. Each flip has a probability of 0.5 heads or tails. Coins do not have "memory".

one fourth

It is 0.1042

It is 0.5

Related questions

There is a 1/8 chance to land three heads.

12.5%

The probability you'd get heads is still one half.

1/2 apex It does not matter what each prior flip's result was. Each flip has a probability of 0.5 heads or tails. Coins do not have "memory".

one fourth

It is 0.1042

The probability of 'heads' on any flip is 50% .

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.

50%.

3/8

It is 0.5

The probability of the coin flip being heads or tails is 100%.