Posted by **betty** on Monday, March 9, 2009 at 11:59pm.

A fair coin is tossed 4 times. Given that each of the first 3 tosses land tails up, what is the probability that all 4 tosses land tails up?

- algebra 2 -
**Lili**, Tuesday, March 10, 2009 at 12:04am
i think ...

isn't it

3/4?

- algebra 2 -
**drwls**, Tuesday, March 10, 2009 at 12:05am
1/2.. Same as a single coin toss. The odds of each toss are independent of what went before.

- algebra 2 -
**Lili**, Tuesday, March 10, 2009 at 12:06am
oh yeah duh haha

it doesn't matter what was before there're two choices haha i remember now :]

hey answer my question!!

- algebra 2 -
**drwls**, Tuesday, March 10, 2009 at 4:19am
I did answer your question

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