U, D, T, C, C, S, SSeries teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What letter is next in the series?
U, D, T, C, C, S, S?
AnswerO. The letters are the first letters of Spanish numbers. Uno, Dos, Tres, Cuatro, Cinco, Seis, Siete, Ocho.
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