How do I do a factorial problem on a TI-30XA? for example 52!/5!

6.721514599 to the power of 65. On my answer sheet it says 2,598,960. 6.721514599 to the power of 65. On my answer sheet it says 2,598,960.

52!/5! is 6.72E65, so the calculator is giving you the correct answer for what you asked of it.

2598960 happens to be 52 C 5, which is 52! / (5! * 47!). Try this:
5 2 2nd [!] / 5 2nd [!] / 4 7 2nd [!] = and
52 nCr 5 =

Do both of those give you the expected answer? 52!/5! is 6.72E65, so the calculator is giving you the correct answer for what you asked of it. 2598960 happens to be 52 C 5, which is 52! / (5! * 47!). Try this: 5 2 2nd [!] / 5 2nd [!] / 4 7 2nd [!] = and 52 nCr 5 = Do both of those give you the expected answer?