Series – Railway Reasoning part – 12

Total Questions: 50

31. 35, 48, 63, 80, ? [RRB NTPC 06/04/2021 (Evening)]

Correct Answer: (c) 99
Solution:

32. Find the missing letter/series to complete the following sequence: [RRB NTPC 07/04/2021 (Morning)]

Correct Answer: (d) 9/R
Solution:

Logic: + 3 in letter part and -4 in number part and then the numerator and denominator are exchanged to get the next term of the series.

33. XQ, UN, RK, OH, LE, ? [RRB NTPC 07/04/2021 (Morning)]

Correct Answer: (a) IB
Solution:

X - 3 = U , U - 3 = R , R - 3 = O , O - 3 = L , L - 3 = I
Q - 3 = N , N - 3 = K , K - 3 = H , H - 3 = E, E - 3 = B

34. U9Y, R14V, O24S, L44P, ? , F164J [RRB NTPC 07/04/2021 (Morning)]

Correct Answer: (d) I84M
Solution:

U - 3 = R , R - 3 = O , O - 3 = L , L - 3 = I
9 + 5 = 14 , 14 + 10 = 24 , 24 + 20 = 44 , 44 + 40 = 84
Y - 3 = V , V - 3 = S , S - 3 = P , P - 3 = M

35. 0, 26, 124, ?, 729 [RRB NTPC 08/04/2021 (Morning)]

Correct Answer: (c) 342
Solution:

1³ − 1 = 0
3³ − 1 = 26
5³ − 1 = 124
7³ − 1 = 342
9³ − 1 = 728

36. X90D, T135H, P180L, L225P, H270T, ? [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (d) D315X
Solution:

Logic - X - 4 = T , T - 4 = P , P - 4 = L , L - 4 = H , H - 4 = D
90 + 45 = 135 , 135 + 45 = 180 , 180 + 45 = 225 , 225 + 45 = 270 ,
270 + 45 = 315
D + 4 = H , H + 4 = L, L + 4 = P , P + 4 = T, T + 4 = X

37. 9, 20, 42, 86, 174, 350, ? [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (a) 702
Solution:

38. MANZ, OAPZ, QARZ, ? [RRB NTPC 23/07/2021 (Morning)]

Correct Answer: (d) SATZ
Solution:

Logic: + 2 in 1st and 3rd letter of the word and 2nd and 4th letter
remain same.
Q + 2, A + 0, R + 2, Z + 0 = SATZ

39. 11, 9, 15, 13, 19, ? [RRB NTPC 23/07/2021 (Morning)]

Correct Answer: (b) 17
Solution:

40. Find the missing letter/series to complete the following sequence: [RRB NTPC 23/07/2021 (Morning)]

Correct Answer: (b) 1/121
Solution: