In a village, $90\%$ of people drink Tea, $80\%$ Coffee, $70\%$ Whiskey, $60\%$ Gin. Nobody drinks all four. What percentage of people drinks alcohol?

score 73 · Answer 13 · 2026-04-17 15:52:10

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Number of arrangements of $5$ boys and $4$ girls such that all $4$ girls do not come together

Published on 17 Apr 2026 - 15:52

score 88 · Answer 14 · 2026-04-14 22:27:36

88

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Why is $\binom{n}{2} = \sum_{i=0}^{n} i = \frac{n(n+1)}{2}$?

Published on 14 Apr 2026 - 22:27

score 415 · Answer 15 · 2026-04-11 19:52:04

415

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Counting the Lipschitz-Functions of two Sets

Published on 11 Apr 2026 - 19:52

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In a village, $90\%$ of people drink Tea, $80\%$ Coffee, $70\%$ Whiskey, $60\%$ Gin. Nobody drinks all four. What percentage of people drinks alcohol?

Number of arrangements of $5$ boys and $4$ girls such that all $4$ girls do not come together

Why is $\binom{n}{2} = \sum_{i=0}^{n} i = \frac{n(n+1)}{2}$?

Counting the Lipschitz-Functions of two Sets

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