alphanumeric series Model Questions & Answers, Practice Test for ibps so 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

6, 12, 21, ?, 48

Answer: (c)

The common differences between the consecutive terms of the series are 6, 9, 12, 15, etc.

Question :22

2, 9, 28, ?, 126, 217

Answer: (c)

The terms exhibit the pattern n3 + 1, n taking values 1, 2, 3.......

Question :23

1, 8, 9, 64, 25, 216, ?, ?

Answer: (d)

The odd terms are squares of the numbers 1,3,5,.... while the even terms are cubes of the numbers 2,4,6,....

Question :24

6, 7, 15, 46, 185 ?

Answer: (c)

Preceding term is multiplied by 1, 2, 3, 4, 5 respectively and then 1 is added to the product

Question :25

YEB, WFD, UHG, SKI, (?)

Answer: (b)

1st letter moves –2 steps each time.

letter moves +1, +2, +3, +4 steps respectively.

3rd letter moves +2, +3, +4 steps respectively.

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