Answer:
D
Step-by-step explanation:
EDG 2021
33
the answer is in the above image
Hello,
if n=15: (4,1),(31,8),(244,63)
if n=7: (8,3),(127,48),(2024,765)
if n=99: (10,1),(199,20),(3970,399)
(Pell 's equation)
i hope you get the answer