# Number of combinations.

• Jul 26th 2011, 05:19 PM
prasum
Number of combinations.
Attachment 21895

in the above figure how many possible ways are there to move in right direction

i am getting 4C1(3C2*1C1*(1/4)^3)+(3C1*1C1*1C1*(1/4)^3)

can yu help me in how to find the probabilty
• Jul 26th 2011, 05:23 PM
pickslides
Re: prob
Assuming we are standing at the origin? The probability of?
• Jul 26th 2011, 08:29 PM
Soroban
Re: prob
Hello, prasum!

Quote:

Attachment 21895

in the above figure, how many possible ways are there to move in right direction?
. . What does this mean?

i am getting: 4C1(3C2*1C1*(1/4)^3) + (3C1*1C1*1C1*(1/4)^3)

Can you help me in how to find the probabilty?
. . The probability of what?

• Jul 27th 2011, 05:22 PM
prasum
Re: prob
Quote:

Originally Posted by Soroban
Hello, prasum!

it is starting from origin
• Jul 27th 2011, 05:24 PM
pickslides
Re: prob
Now which is the 'right' (as in 'left or right' or as in 'right or wrong') direction?
• Jul 27th 2011, 05:31 PM
prasum
Re: prob
left or right