Series – Railway Reasoning part – 11

Total Questions: 50

11. 6, 30, 156, ? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (b) 942
Solution:

12. Find the next two terms of the give number series: [RRB NTPC 11/03/2021 (Evening)]

1 2 5 4 9 8 13 16 17 32 21

Correct Answer: (c) 64 25
Solution:

13. A30L, J30E, A31T, O31R, ? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (c) D31R
Solution:

Here we used first and last letter of alternate month the number in
between is number of days of that month.
A30L = APRIL( used A and L, has 30 days)
J30E = JUNE,
Similarly,
AUGUST = A31T,
OCTOBER = O31R
DECEMBER = D31R

14. 294, 180, 100, 48, ? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (b) 18
Solution:

15. JX5, LU4, NR12, ? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (a) PO11
Solution:

Logic :-
J + 2 = L , L + 2 = N , N + 2 = P
X - 3 = U , U - 3 = R , R - 3 = O
5 - 1 = 4 , 4 × 3 = 12 , 12 - 1 = 11

16. 261, 252, 243, 234, 225, ? [RRB NTPC 12/03/2021 (Morning)]

Correct Answer: (a) 216
Solution:

17. 1, 2.5, 5.5, 11.5, 23.5, ? [RRB NTPC 12/03/2021 (Morning)]

Correct Answer: (b) 47.5
Solution:

18. 3, 8, ? , 33, 53 [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (b) 18
Solution:

19. Find the missing letter/series to complete the following sequence: [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (a) X
Solution:

D + 5 = I , I + 5 = N , N + 5 = S
Similarly, S + 5 = X

20. pj, mg, jd, ga, dx, ? [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (c) au
Solution: