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 Puzzle 1165 What number comes next in this sequence: 1 1 2 4 6 18 21 84 ==?== [Ref: ZMZM] © Kevin Stone Hint: This isn't a common sequence. Answer: 88. The sequence is created using: x1 +1 x2 +2 x3 +3 x4 +4. Puzzle 1166 If a metal nut is heated... ...will the hole in the centre get larger or smaller? [Ref: ZQVV] Hint: Do things get larger as they are heated? Answer: Larger. The entire object will increase in size, including the diameter of the hole. Puzzle 1167 What is the next number in this sequence: 1 11 21 1211 111221 ==?== [Ref: ZSYY] Hint: Say the numbers out loud. Answer: 312211. Each term describes the previous term. Therefore the missing term should be read as: three ones, two twos and one one. Puzzle 1168 What number comes next in this sequence: 1 4 8 13 21 30 36 ==?== [Ref: ZOYR] © Kevin Stone Hint: Try writing the numbers out as letters. Answer: 45. Each term increases by the number of letters in the previous term, 36 >> thirtysix >> 9 letters >> 45.