Question

A six-sided die is rolled 4 times in a row. What is the probability of getting 4 only on the last trial of this experiment?

A. 1/36

B. 4/6

C. 1/1296

D. 125/1296

Answer 1

B

Answer 2

how'd you get that?

Answer 3

1/6+1/6+1/6+1/6 ......... obviously 4/6

Answer 4

ok each time u roll a die .. it has probibality of 4 1/6 ok

Answer 5

so if u will roll it 4 times .. obviously every time u have probibality of 1/6 right .. so u just need to add all the probaibalities ,,.. that will give rise to 4/6

Answer 6

ohhh ok i get it. thank you

Answer 7

ur awesome at math lol :D

Answer 8

may be not .. its simple u should someone else too

Answer 9

so do i divide 75/1296 then for the final answer?

Answer 10

Not really. Look at the answer choices.

Answer 11

yeah i see em. But none of them say 75/1296

Answer 12

well nevermind. I'll just take my best guess, thanks

Answer 13

Sorry, my bad.
The probability of not getting a four on a roll is 5/6. The probability of getting a four is 1/6. The probability of getting 4 only on the last trial of the experiment is:
\[\frac{5}{6}\times\frac{5}{6}\times\frac{5}{6}\times\frac{1}{6}=\frac{125}{1296}\]

Answer 14

thanks your the best

Answer 15

helped me alot

Answer 16

You're welcome :)