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Question

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
XPC, QHT, JZK, CRB, ?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
VJS

The question asks to find the missing term in the given letter series: XPC, QHT, JZK, CRB, ?

Analyzing the Letter Series Pattern

We need to identify the pattern in the series by examining the position of each letter in the alphabet (A=1, B=2, ..., Z=26). Let's break down the series into three parts based on the letter positions.

Pattern in First Letters

Consider the first letter of each term:

  • X (24)
  • Q (17)
  • J (10)
  • C (3)

The difference between consecutive letters is:

  • $24 - 17 = 7$
  • $17 - 10 = 7$
  • $10 - 3 = 7$

The pattern is subtracting 7 from the position of the previous letter. To find the next letter:

  • $3 - 7 = -4$. In a 26-letter alphabet, this corresponds to $26 - 4 = 22$.

The 22nd letter is V.

Pattern in Second Letters

Consider the second letter of each term:

  • P (16)
  • H (8)
  • Z (26)
  • R (18)

The difference between consecutive letters is:

  • $16 - 8 = 8$
  • $8 - 26 = -18$. Or, considering wrap-around, $8 - 8 = 0$, which corresponds to Z (26). So the pattern might be -8.
  • $26 - 18 = 8$

Let's re-examine the pattern assuming a consistent subtraction of 8:

  • Term 1 to Term 2: $16 - 8 = 8$ (H)
  • Term 2 to Term 3: $8 - 8 = 0$. Position 0 corresponds to Z (26).
  • Term 3 to Term 4: $26 - 8 = 18$ (R)

The pattern is consistently subtracting 8. To find the next letter:

  • $18 - 8 = 10$.

The 10th letter is J.

Pattern in Third Letters

Consider the third letter of each term:

  • C (3)
  • T (20)
  • K (11)
  • B (2)

The difference between consecutive letters is:

  • $20 - 3 = 17$
  • $11 - 20 = -9$
  • $2 - 11 = -9$

The pattern appears to be +17, -9, -9. Assuming the pattern continues with -9:

  • $2 - 9 = -7$. In a 26-letter alphabet, this corresponds to $26 - 7 = 19$.

The 19th letter is S.

Determining the Missing Term

Combining the determined letters for each position:

  • First letter: V
  • Second letter: J
  • Third letter: S

Therefore, the missing term is VJS.

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