Question 367007
1.  Just list the elements of the sample space:{RR, RL, LR, LL}.  The probability is 0.25.
2. Letters in common:
U (ULTIMATE and MULTIPLE both have one)
L (ULTIMATE has 1, MULTIPLE has 2)
I (ULTIMATE and MULTIPLE both have one)
M (ULTIMATE and MULTIPLE both have one)
T (ULTIMATE has 2, MULTIPLE has one)
E (ULTIMATE and MULTIPLE both have one)
P(U from ULTIMATE and MULTIPLE) = {{{(1/8)*(1/8) = 1/64}}}
P(L from ULTIMATE and MULTIPLE) = {{{(1/8)*(2/8) = 2/64}}}, etc...
Since the events are mutually exclusive, then the probability that they are the same letters is {{{1/64 + 2/64+1/64+1/64+2/64+1/64 = 8/64 = 1/8}}}.

If you got more questions, email me at brionesr1@gmail.com.
If you got more questions, email me at brionesr1@gmail.com.