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Q: If the first and third digits of each number are interchanged and then the numbers are arranged in descending order, the position of how many numbers will not change ? 7451, 3254, 7353, 3464, 1958
  • A. Zero
  • B. Three
  • C. One
  • D. Two
Correct Answer: Option A - Given, 7451, 3254, 7353, 3464, 1958 According to the question, on interchanging the first and third digit of each number, 5471, 5234, 5373, 6434, 5918 On arranging the number in descending order, 6434, 5918, 5471, 5373, 5234 Hence, it is clear from above that the position of all numbers are changed. Hence, option (a) is correct.
A. Given, 7451, 3254, 7353, 3464, 1958 According to the question, on interchanging the first and third digit of each number, 5471, 5234, 5373, 6434, 5918 On arranging the number in descending order, 6434, 5918, 5471, 5373, 5234 Hence, it is clear from above that the position of all numbers are changed. Hence, option (a) is correct.

Explanations:

Given, 7451, 3254, 7353, 3464, 1958 According to the question, on interchanging the first and third digit of each number, 5471, 5234, 5373, 6434, 5918 On arranging the number in descending order, 6434, 5918, 5471, 5373, 5234 Hence, it is clear from above that the position of all numbers are changed. Hence, option (a) is correct.