Complete the series.
X, U, R, O, L, (…)
The correct answer is the letter I.
If you clearly notice the pattern is as follow:
X - 3 = U
U - 3 = R
R - 3 = O
O - 3 = L
And therefore L - 3 = I, i.e every time 3 letters are decreasing to form the next letter.
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