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Question

A series is given with one term missing. Select the correct alternative from the given options that will complete the series. 

EF27, GI34, IL41, KO48, ?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
MR55

Solving the Series Completion Question: EF27, GI34, IL41, KO48, ?

The question requires finding the missing term in the series EF27, GI34, IL41, KO48. We need to identify separate patterns for the letters and the numbers.

Letter Pattern Analysis

  • The series involves pairs of letters followed by numbers. Let's analyze the progression of the letters based on their position in the alphabet (A=1, B=2, ..., Z=26).
  • First Letter Progression: E (5) G (7) I (9) K (11). The pattern is adding 2 to the position: $5+2=7$, $7+2=9$, $9+2=11$. The next first letter will be at position $11+2=13$, which is M.
  • Second Letter Progression: F (6) I (9) L (12) O (15). The pattern is adding 3 to the position: $6+3=9$, $9+3=12$, $12+3=15$. The next second letter will be at position $15+3=18$, which is R.
  • Combining the next letters gives 'MR'.

Number Pattern Analysis

  • Let's examine the numerical part of the series: 27, 34, 41, 48.
  • Calculate the difference between consecutive numbers:
    • $34 - 27 = 7$
    • $41 - 34 = 7$
    • $48 - 41 = 7$
  • The pattern is consistently adding 7 to the previous number.
  • Therefore, the next number in the series will be $48 + 7 = 55$.

Conclusion

  • Combining the letter pattern (MR) and the number pattern (55), the missing term is MR55.
  • This corresponds to Option B.
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Important Questions from Alpha-numeric series

  1. Consider the following sequence of numbers: 5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 How many odd numbers are followed by the odd number in the above sequence?

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