For the probability of two dice summing to nine, you can have:

Each outcome has , as the dice are fair.

So the probability is

For the probability of two dice summing to five, you can have:

Which gives the same probability as for the sum of the dice to 9.

Because dice rolls are independent, the probability of rolling a 9 with 2 die followed by rolling 5 with 2 die

For binomial expansions,

The 5th term will be (binomial expansion formula).