Probability Question

There are 8 web servers across two clusters that host a bank's website (4 servers in USA-West and 4 servers in USA-East). If we assume that transactions from a given IP/Location will always go to a particular cluster, then a transaction will go to one of4 servers (i.e. there is a 1/4 chance of any server getting a particular transaction). Assume a user completes 5 independent requests sequentially. What is the probability that a user/IP's transaction will occur on the same web server for those 5 requests? Please explain your