I assume the bits in blue are seperate questions, ie you are not expected to find the chance that exactly 3 of the first 5 are odd and the only 6 occurs at the last throw.
N = not a 66 occurs only on the last throw
S = 6
you want NNNNNS
you can use the binomial distribution.exactly three of the first five throws result in odd numbers.
Post your attempt if more info is needed.