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 :21

3,13,53,213 ?

Answer: (c)

The difference in consecutive nos. follows the sequence, 10, 40, 160.

So the next difference = 160 × 4 = 640

Therefore number = 213 + 640 = 853.

Question :22

1, 8, 81, 16, ?, 1296

Answer: (c)

Numbers are in sets of three such that 1 2 = 1, 23 = 8, 34 = 81 and so on

Question :23

ABD, DGK, HMS, MTB, SBL, ..... ?

Answer: (a)

The first letters of the triplets move 3, 4, 5, 6, 7 .... steps forward.

The second letters of the triplets move 5, 6, 7, 8, 9 ... steps forward.

The third letters of the triplets move 7, 8, 9, 10 .... steps forward.

Hence, the next triplet of alphabets is ZKW.

Question :24

1, 3, 8, 19, 42, 89, ?

Answer: (a)

Each of the numbers is doubled and 1, 2, 3, 4, 5, 6 is added in next term, so 89 × 2 + 6 = 184.

Question :25

5, 8, 14, 26, ?, 98

Answer: (a)

Each difference is twice the previous difference.

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