Series – Railway Reasoning part – 12

41. 174, 230, ?, 366, 446 [RRB NTPC 23/07/2021 (Morning)]

(a) 256
(b) 284
(c) 361
(d) 294

Correct Answer: (d) 294

Solution:

174 + 56 = 230
230 + 64 = 294
294 + 72 = 366
366 + 80 = 446

42. Select the combination of letters that when sequentially placed in the blanks of the given series will create a repetitive pattern. [RRB NTPC 23/07/2021 (Evening)]

QR _ Q _ R _ Q _ RRQ

(a) RQRQ
(b) RQQR
(c) QQRQ
(d) QRQR

Correct Answer: (a) RQRQ

Solution:

QR R Q/ Q R R Q/ Q RRQ

43. 11, 9, 18, 16 ,32, ? [RRB NTPC 24/07/2021 (Morning)]

(a) 64
(b) 32
(c) 30
(d) 34

Correct Answer: (c) 30

Solution:

Logic - 11 - 2 = 9, 9 × 2 = 18 , 18 - 2 = 16,16 × 2 = 32 , 32 - 2 = 30

44. 24XV, 35UR, 48QM,? [RRB NTPC 24/07/2021 (Morning)]

(a) 80 LG
(b) 65LH
(c) 63LG
(d) 63MH

Correct Answer: (c) 63LG

Solution:

Logic - 24 + 11 = 35 , 35 + 13 = 48 , 48 + 15 = 63
X - 3 = U , U - 4 = Q , Q - 5 = L
V - 4 = R , R - 5 = M , M - 6 = G

45. 3L12, 5J10, 7H8, 9F6, 11D4, ? [RRB NTPC 24/07/2021 (Morning)]

(a) 13B4
(b) 13B2
(c) 9B6
(d) 13A6

Correct Answer: (b) 13B2

Solution:

Logic - 3 + 2 = 5 , 5 + 2 = 7 , 7 + 2 = 9 , 9 + 2 = 11 , 11 + 2 = 13
L -2 = J , J - 2 = H , H -2 = F , F - 2 = D , D - 2 = B
12 - 2 = 10 , 10 - 2 = 8 , 8 - 2 = 6 , 6 - 2 = 4 , 4 -2 = 2

46. BUDS, CTER, ?, ERGP, FQHO [RRB NTPC 24/07/2021 (Evening)]

(a) DSFQ
(b) DVFP
(c) DWFQ
(d) DTFM

Correct Answer: (a) DSFQ

Solution:

47. 4, 13.5, 32, ?,108 [RRB NTPC 24/07/2021 (Evening)]

(a) 65.5
(b) 49
(c) 62.5
(d) 50.5

Correct Answer: (c) 62.5

Solution:

48. 169, ? , 361, 529 ,841 [RRB NTPC 24/07/2021 (Evening)]

(a) 225
(b) 276
(c) 289
(d) 269

Correct Answer: (c) 289

Solution:

169, ?, 361, 529, 841
Here the pattern is :
13² , 17² , 19² , 23² , 29² [ i.e. square of the prime numbers starting from 13]
So, the second term will be = 17² = 289

49. E5A, G9C, I17E, K29G, M45I, ? [RRB NTPC 26/07/2021 (Morning)]

(a) O63K
(b) O20K
(c) O65K
(d) N65K

Correct Answer: (c) O65K

Solution:

E5A, G9C, I17E, K29G, M45I, ?
For the first letter of each term the pattern is :
E + 2 = G, G + 2 = I, I + 2 = K, K + 2 = M, M + 2 = O
For the numbers in the middle of each term the pattern is :
5 + 4 = 9, 9 + 8 = 17, 17 + 12 = 29, 29 + 16 = 45 , 45 + 20 = 65
And for the last letters of each term the pattern is :
A + 2 = C, C + 2 = E, E + 2 = G, G + 2 = I, I + 2 = K
Then the sixth term will be = O65K