## anonymous one year ago Max tossed a fair coin 3 times. What is the probability of getting heads in the first two trials and tails in the last trial?

1. carolinar7

1/8

2. carolinar7

No its not that

3. Astrophysics

$\text{probability} = \frac{ \text{number of favourable outcomes} }{ \text{number of possible outcomes} }$ and you should note it can never be greater than 1.

4. Astrophysics

So if we flipped one coin for example, we would have $\frac{ fav }{ pos } = \frac{ 1 }{ 2 } = 0.5 = 50 \%$

5. Astrophysics

thats the probability of getting heads if you flip one coin

6. Astrophysics

So if you had two then we would have $\frac{ fav }{ pos } = \frac{ 2 }{ 4 }$ see a patten here?

7. anonymous

so does that mean with three it would be 3/12

8. anonymous

oh wait maybe 3/8

9. anonymous

but if that is true the teacher marked it wrong

10. IrishBoy123

|dw:1437957649821:dw|

11. IrishBoy123

this is a binomial

12. anonymous

so what this tells me is that it is 2/8

13. anonymous

im i correct ?

14. IrishBoy123

go with @Astrophysics i just added this for colour

15. anonymous

but am i correct in my answer 2/8

16. anonymous

thank you i think i got it tough

17. IrishBoy123

mmmm....

18. IrishBoy123

good night

19. Astrophysics

2/8 does not seem right :O