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 oddandthe 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.