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GATE Civil Engineering (CE) 2023 Shift 2 Solved Paper

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Question : 4

Total: 65

There are 4 red, 5 green, and 6 blue balls inside a box. If 𝑁 number of balls are picked simultaneously, what is the smallest value of 𝑁 that guarantees there will be at least two balls of the same colour?
One cannot see the colour of the balls until they are picked.

4
15
5
2

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