(B) The pattern of the number series is as follows:$12 \times 4 - 30 = 48 - 30 = 18$$18 \times 4 - 36 = 72 - 36 = 36$$36 \times 4 - 42 = 144 - 42 = 10

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(B) The pattern of the number series is as follows:$12 \times 4 - 30 = 48 - 30 = 18$$18 \times 4 - 36 = 72 - 36 = 36$$36 \times 4 - 42 = 144 - 42 = 102$$102 \times 4 - 48 = 408 - 48 = 360$$360 \times 4 - 54 = 1440 - 54 = 1386$Thus,the next number in the series is $1386$.