Page 15 - Services Selection Board (SSB) Interviews

Number Series Completion 11
160 × 6 + (6 × 5) = 990 10. (a)
990 × 7 + (7 × 6) = 6972

6972 × 8 + (8 × 7) = 55832
55832 × 9 + (9 × 8) = 502560
6. (e)
⇒ Wrong number is 4914
⇒ Correct number is 4913
11. (d) The series is × 2 + 1, × 2 + 2, × 2 + 3, × 2 +
4, × 2 + 5
7. (c) 12. (a) The series is 18 + 1 = 19; 19 + 2 = 23; 23 +
2
2
2
3 = 32;
2
2
2
32 + 4 = 48; 48 + 5 = 73; 73 + 6 = 109
13. (e) The series is × 0.5 + 0.5, × 1 + 1, × 1.5 + 1.5,
× 2 + 2, × 2.5 + 2.5, × 3 + 3
Prime numbers will be added. So wrong number = 14. (b) The series is × 2 – 2, × 2 – 2, × 2 – 2, × 2 – 2,
27. Correct number is 28. ……

8. (c) 15. Option(c) (2 – 1) × 7 = 7; (7 – 2) × 6 = 30; (30 – 3)
× 5 = 135; (135 – 4) × 4 = 524;
(524 – 5) × 3 = 1557; (1557 – 6) × 2 = 3102
16. (d) pattern is : × 2 + 1, × 3 + 1, × 2 + 1, × 3 + 1,
….
⇒ Wrong number is 1833
17. (b) pattern is : × 1 + 1, × 2 + 2, × 3 + 3, × 4 + 4,
⇒ Correct number is 1836. …….
9. (b) 18. (c) pattern is : the series is the combination of three
series –each term is twice the preceding term.
th
th
st
(i) 1 , 4 , 7 term i.e 2,4,9,…..
nd
th
th
(ii) 2 , 5 , 8 terms i.e 3,6,12…..
th
rd
th
(iii) 3 , 6 , 9 terms i.e 4,8,16…..
⇒ Wrong number = 233 So, 9 is wrong.
⇒ Correct number = 231 19. (c) pattern is : + 6, + 12, + 24, + 48, + 96, + 192
20. (c) pattern is : – 192, – 96, – 48, – 24, – 12, – 6
Concept Cracker

2
2
2
1. (d) The series is × 1.5 + 1.5, × 2.5 + 2.5, × 3.5 + 4. (e) The series is × 2 + 2 , × 3 + 3 , × 4 + 4 , × 5
2
3.5, × 4.5 + 4.5, × 5.5 + 5.5 + 5 , × 6 + 6 2
2. (b) The series is (15 – 6) × 1 = 9; (9 – 5) × 2 = 8; 5. (c) The series is × 1 + 1, × 2 + 2, × 3 + 3, × 4 +
(8 – 4) × 3 = 12; (12 – 3) × 4 = 36, 4, × 5 + 5
(36 – 2) × 5 = 170 6. (c) The series is × 3 – 13
6
5
4
2
3
Similarly the question row, a = (19 – 6) × 1 = 13; b 7. (c) The series is + 2 , + 2 , + 2 , + 2 , + 2 , + 2 7
= (13 – 5) × 2 = 16 8. (e) The series is + 7, + 11, + 13, + 17, + 19, + 23
3. (a) The series is × 1 – 1, × 2 – 2, × 3 – 3, × 4 – 4, 11 + 7 = 18, 18 + 11 = 29, 29 + 13 = 42, 42 +
× 5 – 5 17 = 59, 59 + 19 = 78, 78 + 23 = 101.