Brain Teasers
O, O, T...
Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.Series
O, O, T, T, F, E, T, T, ?
Answer
T.They are the first letters of the numbers in the Fibonacci Sequence.
A Fibonacci Sequence is a famous mathematical sequence where you add the previous two numbers to arrive at the next number. Hence, 1,1,2,3,5,8,13,21
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