A series is given with one term wrong. Select that wrong term from the given alternatives. XL16, ET64, NB256, VJ1024, DR4096
ET64
Each term carries a first letter, a second letter and a number, so test whether every part keeps a steady rule across the five terms.
The numbers \(16, 64, 256, 1024, 4096\) multiply by 4 each step, so every number is consistent.
The second letters L, T, B, J, R advance by 8 places each time (L→T→B→J→R), so they too are consistent.
The first letters should also advance by 8: X, then F, then N, then V, then D (X→F→N→V→D).
The series instead shows X, E, N, V, D, so the second term carries E where the pattern demands F.
Everything else in that term is fine, which pins the fault on the first letter of the second term, ET64.
Replacing E with F, making it FT64, would restore the regular letter progression.
Hence the wrong term in the series is ET64.
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3 X ! I B O # F 4 5 * 1 K 2 $ 8 R 8 % Z