1 5 9 15 ...Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What is the next number in this sequence?
1 5 9 15 ...
HintThese are pretty important things or I wouldn't be writing this...
They signify the vowels in the alphabet. 1=A, 5=E, 9=I, 15=O, 21=U
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