A Unique SeriesSeries teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What number completes this series?
0, 1, 2, 4, 5, 6, 8, 10, 40, 46, 60, 61, 64, 80, 84, ?
HintThink of the names of the numbers (ZERO, ONE, ...). Compare them to the names of the numbers that are not in the series (THREE, SEVEN, ...).
AnswerThe last number is 5000.
The only integer names with no repeated letters are ZERO, ONE, TWO, FOUR, FIVE, SIX, EIGHT, TEN, FORTY, FORTY-SIX, SIXTY, SIXTY-ONE, SIXTY-FOUR, EIGHTY, EIGHTY-FOUR, and FIVE THOUSAND.
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