Series – Railway Reasoning part – 7

Total Questions: 50

11. 5, 12, 54, 306, ? [RRB NTPC 09/01/2021(Evening)]

Correct Answer: (b) 1818
Solution:

5 × 6 - 18 = 12
12 × 6 - 18 = 54
54 × 6 - 18 = 306
306 × 6 - 18 = 1818

12. GPW, HQX, IRY, ? [RRB NTPC 09/01/2021 (Evening)]

Correct Answer: (c) JSZ
Solution:

1st letter of 2nd word
= 1st letter of 1st word + 1
Same for 2nd and 3rd letter of next word
I + 1 = J , R + 1 = S , Y + 1 = Z

13. 5, 18, 70, ? [RRB NTPC 10/01/2021 (Morning)]

Correct Answer: (b) 278
Solution:

14. Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern. [RRB NTPC 10/01/2021 (Morning)]

aba _ bca _ ac _ cab _ cbc

Correct Answer: (a) cbba
Solution:

aba _ bca _ ac _ cab _ cbc Now if we part it into small segments of 3 letters :
aba / _bc / a_a / c_c / ab_ / cbc
Then we can easily find the pattern as :
aba / c bc / a b a / c b c / ab a / cbc

15. Identify the number that is different from the rest. [RRB NTPC 10/01/2021 (Evening)]

23, 29, 31, 37, 42, 43, 47

Correct Answer: (d) 42
Solution:

Except 42, all numbers are prime numbers.

16. Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern. [ RRB NTPC 10/01/2021 (Evening) ]

bb _ cc _ bb _ bcccc _ b

Correct Answer: (d) ccbb
Solution:

bb/_cc_ /bb_b /cccc /_b
In above arrangement we observe that 2 times b then 4 times c And then 4 times b and 4 times c then again 2 times b.

17. CJ, FM, ?, LS, OV [RRB NTPC 10/01/2021 (Evening)]

Correct Answer: (a) IP
Solution:

Logic : 1st letter + 3 = 1st letter of next word
2nd letter + 3 = 2nd letter of next word F + 3 = I, M + 3 = P

18. 290, 325, 362, ? [ RRB NTPC 11/01/2021 (Morning)]

Correct Answer: (c) 401
Solution:

290 + 35 = 325, 325 + 37 = 362 , 362 + 39 = 401

19. Mercury, Venus, Earth, ? [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (b) Mars
Solution:

All planets are in sequence so the next will be Mars.

20. SHGT, UFEV, WDCX, ? [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (d) YBAZ
Solution:

Logic : 1st alphabet + 2 = 1st alphabet of next cluster
2nd alphabet - 2 = 2nd alphabet of next cluster
3rd alphabet - 2 = 3rd alphabet of next cluster
4th alphabet + 2 = 4th alphabet of next cluster
W + 2 = Y, D - 2 = B, C - 2 = A, X + 2 = Z
Next cluster = YBAZ