SOLUTION: What is the probability of rolling 2 number cubes and having the first land on 5’ and the second land on 4’? I got 25/36 let me know if answer matches yours please.

Algebra ->  Probability-and-statistics -> SOLUTION: What is the probability of rolling 2 number cubes and having the first land on 5’ and the second land on 4’? I got 25/36 let me know if answer matches yours please.      Log On


   



Question 798335: What is the probability of rolling 2 number cubes and having the first land on 5’ and the second land on 4’?
I got 25/36 let me know if answer matches yours please.

Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
No.  It's just 1 way out of 36 or 1%2F36  Here's why:

Only one sixth of the time will the first cube land on 5'.

Now only one sixth of those times that the first cube lands on 5',
will the second cube land on 4'.

So the answer verbally is "one sixth of one sixth of the time".

So numerically the answer is 1%2F6%22%D7%221%2F6 or 1%2F36.

Look at it this way.  In the chart below each (↏,↏) represents 
(1st roll, 2nd roll):

(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)

(2,1) (2,2) (2,3) (2,4) (2,5) (2,6) 

(3,1) (3,2) (3,3) (3,4) (3,5) (3,6) 

(4,1) (4,2) (4,3) (4,4) (4,5) (4,6) 

(5,1) (5,2) (5,3) (5,4) (5,5) (5,6) 

(6,1) (6,2) (6,3) (6,4) (6,5) (6,6)

Out of those 36 ways, only the red one has 5' first and 4' second.  
 

Edwin