Suppose you have two fair dice one red one green You must r

Suppose you have two fair dice – one red, one green. You must roll the dice until you obtain “doubles” (1-1, 2-2, ..., 6-6) five times. Let X = the number of failures before the fifth “double”.

A. What is the probability that 7 failures occur before the fifth \"double\"? B. Determine the average and standard deviation For the number of failures before five \"doubles\" are obtained.