yes it was a combined interview with i751 and n400 together, i got a noticed like a week before my interview notifying me it will be a combo interview. The interview was pretty easy and the interviewer went through my paperwork and all that fun stuff and approved my i751 before telling my wife to leave for me to take the N400 test.
Q1 if the president and vice president can longer serve who become the president?
Q2 how many justices do we have in the supreme court?
Q3 name one branch of government?
Q4 when is the last day we send our federal income tax?
Q5 name one state that border canada?
Q6 the political party of the president?
After that we went to written test where he told me to write "We Pay Taxes"
lastly reading test and i passed everything. I was seating in his office when i got text message alert that my both cases has been approved.