Question

There are `85` balloons in a room, red and blue. It is known that:

- At least one of the balloons is red,

- In any pair of balloons we take, at least one of the balloons must be blue.

How many red balloons are in the room?

Difficulty level (1 very easy - 10 very hard): 2

Logic -> Reasoning / Logic Combinatorics -> Case Analysis / Checking Cases -> Processes / Procedures

Sources:

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