(D) The given series follows a specific alternating pattern of multiplication and subtraction:$3 \times 6 = 18$$18 - 6 = 12$$12 \times 6 = 72$$72 - 6

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(D) The given series follows a specific alternating pattern of multiplication and subtraction:$3 \times 6 = 18$$18 - 6 = 12$$12 \times 6 = 72$$72 - 6 = 66$$66 \times 6 = 396$Following this pattern,the next step is to subtract $6$ from the last number:$396 - 6 = 390$Therefore,the missing number is $390$.