Select the option that does NOT belong to the given series:
EC, H, HF, N, KI, U
The logic here is
E + C = 5 + 3 = 8 = H
H + F = 8 + 6 = 14 = N
K + I = 11 + 9 = 20 = T
$$\therefore\ $$U does not belong to the given series
Hence, the correct answer is Option D
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