Z _ 25 _ Y B 23 X C _ W _ 19 _ E 17 Options: A . &nbspA, 21, D, V B . &nbspA, 27, C, V C . &nbspX, 21, C, W D . &nbspX, 27, F, W

Z _ 25 _ Y B 23 X C _ W _ 19

Question

Directions: In each of the following questions, a series of letters and numbers is given, the terms of which follow certain definite pattern in groups. However, some terms in the series are missing, which are given in the same order as one of the alternatives below the series. Choose the correct alternative.

[B.T.M. 2005]

Z _ 25 _ Y B 23 X C _ W _ 19 _ E 17

Options:

A . A, 21, D, V

B . A, 27, C, V

C . X, 21, C, W

D . X, 27, F, W

Answer: Option A
Answer: (a)
From the alternatives, it is clear that the series can be divided into 5 groups of three terms each _ each group comprising of two letters followed by a number.
Z __ 25 / Y B 23 / X C __ / W _ 19 / _ E 17
Observing the group Y B 23, we find that in a group, the number is the difference of the numbers representing the positions of the two letters in the English alphabet.
Thus, putting A = 1, B = 2, ....., Y = 25, Z = 26,
we have : Y - B = 25 - 2 = 23.
Similarly, missing term is 3rd group = X -C = 24 - 3 = 21;
missing term in 1st group = Z - 25 = 26 - 25 = 1 = A.
So, the first and second missing terms are A and 21 respectively, which are given only in (a).

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