Series – Railway Reasoning part – 8

Total Questions: 50

1. 7, 22, 45, 76, 115, ? [RRB NTPC 19/01/2021 (Morning)]

Correct Answer: (b) 162
Solution:

2. In a certain code language, ‘MRNQSL’ is written as SZXWAV’. What is the code for ‘STVZBQ’ in that code language? [RRB NTPC 19/01/2021 (Evening)]

Correct Answer: (d) YBFFJA
Solution:

‘MRNQSL’ is written as ‘SZXWAV’
M + 6 = S , R + 8 = Z
N + 10 = X, Q + 6 = W
S + 8 = A, L + 10 = C
Similarly,
‘STVZBQ’ coded as YBFJFA

3. 2D, 3I, 4P, ? [RRB NTPC 20/01/2021 (Morning)]

Correct Answer: (c) 5Y
Solution:

2D, 3I, 4P, ?
In the above series the numbers associated with the letters is the square root of the place values of the corresponding letters :
So, the fourth term will be 5Y.
[𝑌 = 25,  √25 =5]

4. 13, 28, 58, ?, 238 [RRB NTPC 20/01/2021 (Morning)]

Correct Answer: (d) 118
Solution:

13, 28, 58, ?, 238
In the above series the pattern is :
13 × 2 + 2 = 28
28 × 2 + 2 = 58
So, 58 × 2 + 2 = 118
Then 118 × 2 + 2 = 238
i.e. the fourth term is 118.

5. Complete the following alphabetical sequence. [RRB NTPC 20/01/2021 (Morning)]

A, AC, DAD, FEE, JACK, _______

Correct Answer: (a) RIDE
Solution:

In series the pattern is :
A = 1 = 1²
AC = 4 = 2²
DAD = 9 = 3²
FEE = 16 = 4²
JACK = 25 = 5²
So, the sixth term will be RIDE = 6² = 36

6. Identify the number that does NOT belong to the following series. [RRB NTPC 20/01/2021 (Morning)]

7, 14, 56, 448, 2688, 26880

Correct Answer: (a) 448
Solution:

7. 12, 49, 197, 789, ? [RRB NTPC 20/01/2021 (Evening)]

Correct Answer: (c) 3157
Solution:

Logic : (Number ) + 1 = Next number × 4
Next number = (789 ) + 1 = 3157

8. A11, D8, G5, ? [RRB NTPC 21/01/2021 (Morning) ]

Correct Answer: (a) J2
Solution:

9. 40, 36, 33, 31, ? [RRB NTPC 21/01/2021 (Morning)]

Correct Answer: (b) 30
Solution:

10. 4, 6, 8, 18, 16, ? [RRB NTPC 21/01/2021 (Morning)]

Correct Answer: (b) 54
Solution: