If you tossed a coin 10 times, what is the probability of landing on tails every time

For a fair coin, the probability of tails is 1/2 or 0.5, so the probability of all tails in 10 tosess is (1/2)^10 = 1/1024 = 0.0009765625 

You have a 1/2 chance of it landing on tails, separately, each time.

(1/2)/10=.05

5/100

Divide both sides by 5.

1/20

You have a 1/20 chance that you will land on tails every time.

I hope this helps!
~kaikers

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.