Number Properties, Statistics and Sets Problems

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A

B

C

D

E

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25 integers are written on a board. Are there at least two consecutive integers among them?

1) For every value in the list, if the value is increased by 1, the number of distinct values in the list does not change.

2) At least one value occurs more than once in the list.

The OA is C

Source: Veritas Prep