Number Series MCQs set 3 for ISSB - Pak Army Officer Selection intelligence — 20 solved questions.
Q1. Next number: 1, 2, 6, 24, 120, ?
Answer: 720
Explanation: Multiply by 2,3,4,5,6 so 120 times 6 is 720. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q2. Next number: 8, 13, 21, 34, 55, ?
Answer: 89
Explanation: Fibonacci style sum of previous two gives 89. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q3. Next number: 3, 5, 9, 17, 33, ?
Answer: 65
Explanation: Pattern doubles and subtracts 1 so 33 times 2 minus 1 is 65.
Q4. Next number: 50, 45, 41, 38, 36, ?
Answer: 35
Explanation: Differences decrease by 1: minus 5,4,3,2 so minus 1 gives 35. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q5. Next number: 10, 20, 40, 80, 160, ?
Answer: 320
Explanation: Each term doubles so next is 320. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q6. Next number: 2, 3, 5, 7, 11, 13, ?
Answer: 17
Explanation: Prime number sequence so next after 13 is 17. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q7. Next number: 81, 64, 49, 36, 25, ?
Answer: 16
Explanation: Descending perfect squares so next is 16. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q8. Next number: 7, 10, 14, 19, 25, ?
Answer: 32
Explanation: Differences 3,4,5,6 so add 7 to get 32. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q9. Next number: 1, 4, 10, 22, 46, ?
Answer: 94
Explanation: Pattern doubles and adds 2 so 46 times 2 plus 2 is 94.
Q10. Next number: 5, 6, 8, 11, 15, 20, ?
Answer: 26
Explanation: Differences increase by 1 each step so add 6 to get 26.
Q11. Next number: 5, 12, 26, 54, ?
Answer: 110
Explanation: Pattern doubles and adds 2 so 54 times 2 plus 2 is 110.
Q12. Next number: 7, 14, 28, 56, 112, ?
Answer: 224
Explanation: Each term doubles so next is 224. 224 is correct because it matches what the question requires. Spot the relationship or pattern quickly under ISSB time limits.
Q13. Next number: 2, 5, 11, 23, 47, ?
Answer: 95
Explanation: Pattern doubles and adds 1 so 47 times 2 plus 1 is 95.
Q14. Next number: 9, 18, 36, 72, 144, ?
Answer: 288
Explanation: Each term doubles so next is 288. 288 is correct because it matches what the question requires. Spot the relationship or pattern quickly under ISSB time limits.
Q15. Next number: 60, 55, 49, 42, 34, ?
Answer: 25
Explanation: Differences decrease by 1: minus 5,6,7,8 so minus 9 gives 25. Spot the relationship or pattern quickly under ISSB time limits.
Q16. Next number: 4, 7, 13, 25, 49, ?
Answer: 97
Explanation: Pattern doubles and subtracts 1 so 49 times 2 minus 1 is 97.
Q17. Next number: 3, 6, 12, 24, 48, ?
Answer: 96
Explanation: Each term doubles so next is 96. 96 is correct because it matches what the question requires. Spot the relationship or pattern quickly under ISSB time limits.
Q18. Next number: 11, 22, 44, 88, 176, ?
Answer: 352
Explanation: Each term doubles so next is 352. 352 is correct because it matches what the question requires. Spot the relationship or pattern quickly under ISSB time limits.
Q19. Next number: 6, 9, 14, 21, 30, ?
Answer: 41
Explanation: Differences 3,5,7,9 so add 11 to get 41. Spot the relationship or pattern quickly under ISSB time limits.
Q20. Next number: 2, 6, 14, 30, 62, ?
Answer: 126
Explanation: Pattern doubles and adds 2 so 62 times 2 plus 2 is 126.