418531 ภาคต้น 2552/โจทย์ปัญหาการพิสูจน์ II/เฉลยข้อ 4

ข้อย่อย 1

Error

Too many requests (f061ab2)

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Request served via cp5021 cp5021, Varnish XID 502629319
Upstream caches: cp5021 int
Error: 429, Too many requests (f061ab2) at Thu, 22 Jan 2026 11:48:31 GMT


Sensitive client information

IP address: 158.108.32.49

$a_{n}={\begin{cases}-2,&n=0\\a_{n-1}+4,&n>0\end{cases}}$