The probability of getting only one tails is (1/2)7. With seven permutations of which flip is the tails, this gives a probability of:
P(six heads in seven flips) = 7*(1/2)7 = 7/128
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1/2
The conditional probability is 1/4.
The probability of tossing a coin and getting heads is 0.5
Zero. Since coins land on Heads or Tails and not numbers.
If they are fair coins, it is 1/16.