Each dice has a 1/6 chance to roll a six which means there are 6^5 possible rolls that 5 dice could have
if we isolate the roles that have a six, that means we are dividing the equation by 6
because only a 6th of them have a six, which brings it down to 6^4 possible roles
then we isolate the next six which would be the same thing because only a 6th of them have a six
so it would be 6^3 possible roles
next we need to turn 6^3 possible roles in to a fraction which involes divididing it from 6^5
which would be a 1/6^2 chance or 1/32 chance of roling a pair of sixes
I should mention the reason why I know this is because I was bored and wanted to know the
chances of getting a yatzee on the first roll (which is 1/6^4 by the way)