ISSB - PAF Officer Selection Mathematics Number Series — Set 2

ISSB - PAF Officer Selection Mathematics Number Series — Set 2

1. Question 1

   Q1. Next: 7, 10, 15, 22, ?

   • A) 29
   • B) 31
   • C) 33
   • D) 35

   Answer: 31

   Explanation: Differences are 3, 5, 7, so next is 9. 22 plus 9 equals 31.

2. Question 2

   Q2. Next: 4, 5, 7, 10, 14, ?

   • A) 18
   • B) 19
   • C) 20
   • D) 21

   Answer: 19

   Explanation: Differences are 1, 2, 3, 4, so next is 5. 14 plus 5 equals 19.

3. Question 3

   Q3. Next number: 3, 6, 12, 24, ?

   • A) 30
   • B) 36
   • C) 48
   • D) 72

   Answer: 48

   Explanation: Each term doubles so 24 times 2 gives 48. Work each step carefully; ISSB math rewards accuracy under time pressure.

4. Question 4

   Q4. Next number: 5, 10, 20, 40, ?

   • A) 60
   • B) 70
   • C) 80
   • D) 100

   Answer: 80

   Explanation: Each term doubles so next is 80. Work each step carefully; ISSB math rewards accuracy under time pressure.

5. Question 5

   Q5. Next number: 2, 6, 12, 20, 30, ?

   • A) 38
   • B) 40
   • C) 42
   • D) 44

   Answer: 42

   Explanation: Differences increase by 2 each time so add 12 to get 42.

6. Question 6

   Q6. Next number: 81, 27, 9, 3, ?

   • A) 0
   • B) 1
   • C) 2
   • D) 6

   Answer: 1

   Explanation: Each term is divided by 3 so next is 1. Work each step carefully; ISSB math rewards accuracy under time pressure.

7. Question 7

   Q7. Next: 7, 14, 21, 28, ?

   • A) 32
   • B) 35
   • C) 42
   • D) 49

   Answer: 35

   Explanation: Add 7 each step so next term is 35. Work each step carefully; ISSB math rewards accuracy under time pressure.

8. Question 8

   Q8. Next: 1, 1, 2, 3, 5, ?

   • A) 6
   • B) 7
   • C) 8
   • D) 9

   Answer: 8

   Explanation: Fibonacci sequence adds previous two so next is 8. Work each step carefully; ISSB math rewards accuracy under time pressure.

9. Question 9

   Q9. Next: 64, 32, 16, 8, ?

   • A) 2
   • B) 4
   • C) 6
   • D) 0

   Answer: 4

   Explanation: Each term is half the previous so next is 4. Work each step carefully; ISSB math rewards accuracy under time pressure.

10. Question 10

    Q10. Next: 2, 3, 5, 8, 12, ?

    • A) 15
    • B) 16
    • C) 17
    • D) 18

    Answer: 17

    Explanation: Differences 1,2,3,4 so add 5 to get 17. Work each step carefully; ISSB math rewards accuracy under time pressure.

11. Question 11

    Q11. Next: 11, 22, 44, 88, ?

    • A) 132
    • B) 154
    • C) 176
    • D) 188

    Answer: 176

    Explanation: Each term doubles so next is 176. Work each step carefully; ISSB math rewards accuracy under time pressure.

12. Question 12

    Q12. Next number: 7, 14, 21, 28, ?

    • A) 32
    • B) 35
    • C) 42
    • D) 49

    Answer: 35

    Explanation: Add 7 each step so after 28 comes 35. Work each step carefully; ISSB math rewards accuracy under time pressure.

13. Question 13

    Q13. Next number: 2, 6, 18, 54, ?

    • A) 108
    • B) 162
    • C) 216
    • D) 72

    Answer: 162

    Explanation: Multiply by 3 each time so 54 times 3 is 162. Work each step carefully; ISSB math rewards accuracy under time pressure.

14. Question 14

    Q14. Next number: 11, 22, 44, 88, ?

    • A) 132
    • B) 154
    • C) 176
    • D) 198

    Answer: 176

    Explanation: Each term doubles so next is 176. Work each step carefully; ISSB math rewards accuracy under time pressure.

15. Question 15

    Q15. Next number: 64, 32, 16, 8, ?

    • A) 2
    • B) 4
    • C) 6
    • D) 0

    Answer: 4

    Explanation: Each term halves so next is 4. Work each step carefully; ISSB math rewards accuracy under time pressure.

16. Question 16

    Q16. Next number: 3, 8, 15, 24, 35, ?

    • A) 46
    • B) 48
    • C) 50
    • D) 52

    Answer: 48

    Explanation: Differences 5,7,9,11 so add 13 to get 48. Work each step carefully; ISSB math rewards accuracy under time pressure.

17. Question 17

    Q17. Next number: 5, 11, 23, 47, ?

    • A) 71
    • B) 83
    • C) 95
    • D) 99

    Answer: 95

    Explanation: Pattern doubles and adds 1 so 47 times 2 plus 1 is 95.

18. Question 18

    Q18. Next number: 100, 96, 88, 76, ?

    • A) 58
    • B) 60
    • C) 62
    • D) 64

    Answer: 60

    Explanation: Differences increase by 4: minus 4,8,12 so minus 16 gives 60. Work each step carefully; ISSB math rewards accuracy under time pressure.

19. Question 19

    Q19. Next number: 0, 1, 1, 2, 3, 5, 8, ?

    • A) 11
    • B) 12
    • C) 13
    • D) 14

    Answer: 13

    Explanation: Fibonacci sequence so 5 plus 8 equals 13. Apply the same method to similar ISSB quantitative items.

20. Question 20

    Q20. Next number: 729, 243, 81, 27, ?

    • A) 3
    • B) 6
    • C) 9
    • D) 18

    Answer: 9

    Explanation: Divide by 3 each step so next is 9. Apply the same method to similar ISSB quantitative items.