Series – Railway Reasoning part – 10

Total Questions: 50

11. 2, 5, 11, 20, 32, 47, ? [RRB NTPC 17/02/2021 (Morning)]

Correct Answer: (b) 65
Solution:

12. Identify the number that DOES NOT belong to the following series [RRB NTPC 17/02/2021 (Morning)]

3, 5, 9, 15, 26, 33, 45, 59

Correct Answer: (d) 26
Solution:

3 + 2 = 5
5 + 4 = 9
9 + 6 =15
15 + 8 = 23 ≠ 26
23 + 10 = 33
33 + 12 = 45
45 + 14 = 59

13. E972D, H324E, K108G, N36J, Q12N, ? [RRB NTPC 17/02/2021 (Evening)]

Correct Answer: (c) T4S
Solution:

1st letter + 3 = 1st letter of the next term Number ÷ 3 = next number
2nd letter - ( + 1, + 2, + 3 ... ) respectively = 2nd letter of the next term
Next term = Q + 3 = T, N + 5 = S ⇒ T4S

14. 619, 656, 693, 730, ? [RRB NTPC 17/02/2021 (Evening)]

Correct Answer: (b) 767
Solution:

619 + 37 = 656
656 + 37 = 693
693 + 37 = 730
730 + 37 = 767

15. AZ, CX, GT, ? [RRB NTPC 17/02/2021 (Evening)]

Correct Answer: (a) MN
Solution:

A + 2 = C, C + 4 = G, G + 6 = M
And opposite of these letters are written Next will be = MN

16. Identify the term does NOT belong to the following series. [RRB NTPC 22/02/2021 (Evening)]

3T3, 5S5, 9R7, 12P8, 23P11

Correct Answer: (a) 12P8
Solution:

T - 1 = S, S - 1 = R, R - 1 = Q ≠ P, Q - 1 = P

17. 12, 17, 14, 19, 16, 21, 18, ? [RRB NTPC 22/02/2021 (Evening)]

Correct Answer: (b) 23
Solution:

18. 3, 5, 9, 15, 23, 33, 45, 59, ? [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (a) 75
Solution:

3 + 2 = 5, 5 + 4 = 9
9 + 6 = 15, 15 + 8 = 23
23 + 10 = 33, 33 + 12 = 45
45 + 14 = 59, 59 + 16 = 75

19. 16S8, 33M12, 50G18, 67A26, ? [RRB NTPC 27/02/2021 (Evening)]

Correct Answer: (a) 84U36
Solution:

Logic -
16 + 17 = 33 , 33 + 17 = 50 , 50 + 17 = 67 ,67 + 17 = 84
S - 6 = M , M - 6 = G , G - 6 = A , A - 6 = U
8 + 4 = 12 , 12 + 6 = 18 , 18 + 8 = 26 , 26 + 10 = 36

20. B8E, G27J, L64O, ? [RRB NTPC 27/02/2021 (Evening)]

Correct Answer: (b) Q125T
Solution:

B + 5 = G , G + 5 = L , L + 5 = Q
2³ = 8 , 3³ = 27 , 4³ = 64 , 5³ = 125
E + 5 = J , J + 5 = O , O + 5 = T
Next term = Q125T