質問: "find the next term in the series. 3, 4, 13, 38, 87, 168" "find the next term in the series. 3, 4, 13, 38, 87, 168, ?"
回答: "calculation ⇒ 3 + 12 = 4 ⇒ 4 + 32 = 13 ⇒ 13 + 52 = 38 ⇒ 38 + 72 = 87 ⇒ 87 + 92 = 168 ⇒ 168 + 112 = 289 ∴ the next number in series is 289"