Multiple choice Directions: Fill the blank with correct alternative 165, 195, 255, 285, 345, (…..) 375 420 435 390 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Each number is 15 multiplied by a prime number i.e. 15*11, 15*13, 15*17, 15*19, 15*23. So, missing number = 15*29 = 435.