issb intelligence MCQ #914

Series w15-9: 4, 9, 19, 39, ?

issb intelligence MCQ #914

  1. Question 1

    Q1. Series w15-9: 4, 9, 19, 39, ?

    • A) 69
    • B) 79
    • C) 89
    • D) 99

    Answer: 79

    Explanation: Pattern doubles and adds one giving 79 for wave 15. Work each step carefully; ISSB math rewards accuracy under time pressure.