the probabiluty of two coins landing on tails is 1/2 x 1/2 = 1/4, or one chance in four
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It is 1/2.
well since the coins have two sides,there is a 50% chance of it landing on heads
Because you are thinking permutations rather than combinations. There are four permutations of two coins, but there are only three combinations, because it does not matter which coin is heads and which coin is tails. As a result, the combination of heads and tails has a 0.5 probability, while two heads or two tails each have a 0.25 probability.
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.
2/9