Question

66, 36, 18, (?) A) 3
B) 6
C) 8
D) 9

Answer 1

Each number is the series is the product of the digit of the preceding number.

Thus, 6 * 6 = 36,

3 * 6 = 18 and so on.

.'. Missing number = 1 * 8 = 8.

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