Reasoning : Logical Reasoning & Analytical Ability

Q 126 / 325

UPSC CSE Prelims 2020

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?

EXPLANATION

Correct Option (B)

To determine the number of odd numbers followed by an odd number, the given sequence is systematically examined for consecutive pairs where both elements are odd.

The sequence provided is: 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

The pairs satisfying the condition (Odd number, followed by Odd number) are identified as follows:

  • (5, 1)
  • (7, 3)
  • (3, 9)
  • (5, 7)
  • (3, 1)
  • (1, 5)

A count of these identified instances yields a total of 6 such occurrences within the sequence.

Incorrect Options:

Options A (5), C (7), and D (8) are incorrect. A precise enumeration of the sequence reveals exactly 6 instances where an odd number is immediately succeeded by another odd number. Therefore, these alternative counts do not align with the accurate analysis of the given number sequence.

Explanation figure for the question: 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…