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ABB, BCF, CDL, DET, _______

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answer is B.

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Detailed Solution

A B B, B C F, C D L, D E T, E F D

1 × 2 = 2 2 × 3 = 6 3 × 4 = 12 4 × 5 = 20 5 × 6 = 30

First two letters are consecutive.

Third letter is product of first two letters position.

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