Question

if a fair coin is tossed 3 times, what is the probability of getting 3 tails?

1 1/3
2 3/3
3 3/8
4 1/8

is it 3/3.... coz all 3 could be tail also ....am i right?

Answer 1

plz help me

Answer 2

toss the coin once, what is the prob of getting heads? 1/2 right?

now does the coin have a memory of what happened last time?
so toss it again.
What is the prob this time? Still 1/2, right?
now now you have 1/2*1/2 of two in a row.
What would it be 3 times in a row???

BTW, a prob of 3/3 is a prob of 1, which means "absolute certainty"

In that case you should be willing to bet $ 1 million that you will get 3 heads in 3 tosses. What do you think??

Answer 3

thanks