ISSB - PAF Officer Selection Mathematics Number Series — Set 3

ISSB - PAF Officer Selection Mathematics Number Series — Set 3

1. Question 1

   Q1. Next number: 3, 9, 27, 81, ?

   • A) 162
   • B) 216
   • C) 243
   • D) 324

   Answer: 243

   Explanation: Multiply by 3 each time so 81 times 3 is 243. Apply the same method to similar ISSB quantitative items.

2. Question 2

   Q2. Next number: 13, 26, 52, 104, ?

   • A) 156
   • B) 208
   • C) 260
   • D) 312

   Answer: 208

   Explanation: Each term doubles so next is 208. 208 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

3. Question 3

   Q3. Next number: 128, 64, 32, 16, ?

   • A) 4
   • B) 6
   • C) 8
   • D) 10

   Answer: 8

   Explanation: Each term halves so next is 8. 8 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

4. Question 4

   Q4. Next number: 4, 9, 16, 25, 36, ?

   • A) 42
   • B) 45
   • C) 49
   • D) 52

   Answer: 49

   Explanation: Perfect squares so next is 7 squared which is 49. Apply the same method to similar ISSB quantitative items.

5. Question 5

   Q5. Next number: 6, 12, 24, 48, 96, ?

   • A) 144
   • B) 168
   • C) 192
   • D) 216

   Answer: 192

   Explanation: Each term doubles so next is 192. Work each step carefully; ISSB math rewards accuracy under time pressure.

6. Question 6

   Q6. Next number: 4, 10, 22, 46, 94, ?

   • A) 170
   • B) 180
   • C) 190
   • D) 200

   Answer: 190

   Explanation: Pattern doubles and adds 2 so 94 times 2 plus 2 is 190.

7. Question 7

   Q7. Next number: 150, 140, 127, 112, ?

   • A) 93
   • B) 95
   • C) 97
   • D) 99

   Answer: 95

   Explanation: Differences minus 10,13,15 so minus 17 gives 95. Work each step carefully; ISSB math rewards accuracy under time pressure.

8. Question 8

   Q8. Next number: 2, 3, 5, 8, 13, 21, ?

   • A) 28
   • B) 31
   • C) 34
   • D) 37

   Answer: 34

   Explanation: Fibonacci style sum of previous two gives 34. Work each step carefully; ISSB math rewards accuracy under time pressure.

9. Question 9

   Q9. Next number: 243, 81, 27, 9, ?

   • A) 1
   • B) 2
   • C) 3
   • D) 6

   Answer: 3

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

10. Question 10

    Q10. Next number: 7, 14, 28, 56, ?

    • A) 84
    • B) 98
    • C) 112
    • D) 128

    Answer: 112

    Explanation: Each term doubles so after 56 comes 112. Work each step carefully; ISSB math rewards accuracy under time pressure.

11. Question 11

    Q11. Next number: 100, 95, 87, 76, ?

    • A) 60
    • B) 62
    • C) 64
    • D) 66

    Answer: 62

    Explanation: Differences minus 5,8,11 so minus 14 gives 62. Work each step carefully; ISSB math rewards accuracy under time pressure.

12. Question 12

    Q12. Next number: 512, 256, 128, 64, ?

    • A) 16
    • B) 24
    • C) 32
    • D) 48

    Answer: 32

    Explanation: Each term halves so next is 32. Work each step carefully; ISSB math rewards accuracy under time pressure.

13. Question 13

    Q13. Next number: 5, 11, 23, 47, 95, ?

    • A) 179
    • B) 185
    • C) 191
    • D) 197

    Answer: 191

    Explanation: Pattern doubles and adds 1 so 95 times 2 plus 1 is 191.

14. Question 14

    Q14. Next number: 1, 3, 7, 15, 31, ?

    • A) 55
    • B) 61
    • C) 63
    • D) 65

    Answer: 63

    Explanation: Pattern doubles and adds 1 so 31 times 2 plus 1 is 63.

15. Question 15

    Q15. Next number: 9, 18, 36, 72, ?

    • A) 108
    • B) 126
    • C) 144
    • D) 162

    Answer: 144

    Explanation: Each term doubles so after 72 comes 144. Work each step carefully; ISSB math rewards accuracy under time pressure.

16. Question 16

    Q16. Next number: 6, 12, 24, 48, ? (ISSB set 17-5)

    • A) 96
    • B) 98
    • C) 93
    • D) 101

    Answer: 96

    Explanation: Each term doubles; after 48 comes 96. 96 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

17. Question 17

    Q17. Next number: 6, 12, 24, 48, ? (ISSB set 17-10)

    • A) 96
    • B) 98
    • C) 93
    • D) 101

    Answer: 96

    Explanation: Each term doubles; after 48 comes 96. 96 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

18. Question 18

    Q18. Next number: 6, 12, 24, 48, ? (ISSB set 17-15)

    • A) 96
    • B) 98
    • C) 93
    • D) 101

    Answer: 96

    Explanation: Each term doubles; after 48 comes 96. 96 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

19. Question 19

    Q19. Next number: 6, 12, 24, 48, ? (ISSB set 17-20)

    • A) 96
    • B) 98
    • C) 93
    • D) 101

    Answer: 96

    Explanation: Each term doubles; after 48 comes 96. 96 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

20. Question 20

    Q20. Next number: 6, 12, 24, 48, ? (ISSB set 17-25)

    • A) 96
    • B) 98
    • C) 93
    • D) 101

    Answer: 96

    Explanation: Each term doubles; after 48 comes 96. 96 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.