Multiple choice Directions: Fill the blank with correct alternative 66, 36, 18, (…..) 3 6 8 9 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Each number in the series is the product of the digits of the preceding number.Thus, 6*6 = 36, 3*6 = 18 and so on. So, missing number = 1*8 = 8