Exams › IBPS PO › Quantitative Aptitude

In number 7846314: add 1 to each even digit, subtract 1 from each odd digit. How many digits are repeated in the new number?

1. Three
2. Five
3. One
4. Two

Correct answer: One

Solution

Odd digits: 7→6, 3→2, 1→0. Even digits: 8→9, 4→5, 6→7, 4→5. New sequence: 6,9,5,7,2,0,5. Only digit 5 is repeated (appears at positions 3 and 7). One repeated digit.

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