Solution #13: An Unusual Series
Each term consists of the first digit of the preceding term multiplied by the
second digit of the same term. Thus,
49 = 7 x 7
36 = 4 x 9
18 = 3 x 6
Hence, the fifth term is 1 x 8 = 8.
Source: Longley-Cook, L. H.
Categories: Reasoning, Patterns/sequences
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