Four coins are tossed several times. Which of the following represents the outcome on a coin that may not be fair?

4th coin is tossed 25,000 times and gives 12,505 heads.
2nd coin is tossed 250 times so that P(heads) = 0.25.
3rd coin is tossed 16 times and gives P(tails) = 9/16
1st coin is tossed 50 times and gives 24 heads and 26 tails.