alphanumeric series Model Questions & Answers, Practice Test for ibps clerk prelims

Directions:

In each of these questions, various terms of a series are given with one term missing as shown by (?). Choose the missing term :

Question :26

3, 15, 4, 16, 5, 17, 6, ?, 7

Answer: (a)

There are two alternate series.

1st series : 3, 4, 5, 6, 7 ........ and so on.

2nd series : 15, 16, 17,18, 19 ....... and so on.

Question :27

D I L Q T Y B G ?

Answer: (d)

After D, 4 letters are skipped and I follows after which 2 letters are skipped Trend flows alternatively :

D(EFGH) I (JK) L(MNOP) Q (RS) T(UVWX) Y(ZA) B(CDEF) G(HI) J.

Question :28

7, 13, 27, 53, ?, 213

Answer: (a)

× 2 ± 1.

Thus 53 × 2 + 1 = 107

Question :29

cx fu ir ? ol ri

Answer: (b)

The first letter of each term is moved three steps forward and the second letter is moved three steps backward to obtain the corresponding letters of the next term.

Question :30

3, 6, 24, 30, 63, 72, ?, 132

Answer: (c)

Terms taken alternately form two sequences.

These are

3, 24, 63 ?6, 30, 72, 132
3 = 22 – 16 = 22 + 2
24 = 52130 = 52 + 5
63 = 82 – 172 = 82 + 8

Next term = 112 – 1 = 120

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