Brain Teasers
A Unique Series
What number completes this series?
0, 1, 2, 4, 5, 6, 8, 10, 40, 46, 60, 61, 64, 80, 84, ?
0, 1, 2, 4, 5, 6, 8, 10, 40, 46, 60, 61, 64, 80, 84, ?
Hint
Think of the names of the numbers (ZERO, ONE, ...). Compare them to the names of the numbers that are not in the series (THREE, SEVEN, ...).Answer
The 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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