Insert the missing number 3, 18, 12, 72, 66, 396 , ?.

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Insert the missing number 3, 18, 12, 72, 66, 396 , ?.

1. 300
2. 380
3. 350
4. 390

Correct Option: D

The pattern is :
3 × 6 = 18
18 – 6 = 12
12 × 6 = 72
72 – 6 = 66
66 × 6 = 396
396 – 6 = ?
∴ ? = 390
Hence , the missing number in given series is 390 .