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This question is based on the five, three-digit numbers given below. (Left) 473 987 324 529 648 (Right) (Example: 697 тАУ First digit = 6, second digit = 9 and third digit = 7) NOTE: All the operations to be performed from left to right. The position of how many numbers will remain unchanged if all these numbers are arranged in ascending order?
None
One
Three
Two
None
Write the original numbers in a horizontal line, then write their sorted versions directly underneath each corresponding position to compare them column by column.
Write the original numbers in a horizontal line, then write their sorted versions directly underneath each corresponding position to compare them column by column.
List the original numbers
The given numbers are: 473, 987, 324, 529, 648.
Arrange in ascending order
Sorting the set gives: 324, 473, 529, 648, 987.
Compare positions index-by-index
Compare the original at each index (1st, 2nd, 3rd, 4th, 5th) with the sorted version: 473!=324, 987!=473, 324!=529, 529!=648, 648!=987. None of the values match their original position.
B: Incorrect, as no element stayed at its original index. C: Incorrect, as zero, not three, elements remain. D: Incorrect, as zero, not two, elements remain.
A is correct because when comparing the original sequence (473, 987, 324, 529, 648) with the ascending sequence (324, 473, 529, 648, 987), no number occupies the same position it started in.
In such questions, always write the two lists one below the other vertically; it reduces manual errors significantly compared to comparing them horizontally.
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