Tag Archives: Probability

Brainteaser about one set being a subset of another

Let be a set of cardinality . You uniformly and independently choose two subsets . What is the probability that ? Let’s solve this by counting the total possible number of pairs , and the number of pairs which satisfy … Continue reading

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[Soln] Problem involving two coins

Let such that . Assume we have two coins such that the probability of coin 1 landing on heads (after flipping it) is and the probability of coin 2 landing on heads is . For what values of do there … Continue reading

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Problem involving two coins

Let such that . Assume we have two coins such that the probability of coin 1 landing on heads (after flipping it) is and the probability of coin 2 landing on heads is . For what values of do there … Continue reading

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[Soln] Central Limit Theorem: Strange Result!

For , define the random variable Let . Prove that as , a) the distribution of converges to for some real number , b) but converges to 2. (Credits: I learnt of this problem from Persi Diaconis in my probability class.)

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[Hints] Central Limit Theorem: Strange Result!

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Central Limit Theorem: Strange Result!

For , define the random variable Let . Prove that as , a) the distribution of converges to for some real number , b) but converges to 2. (Credits: I learnt of this problem from Persi Diaconis in my probability class.)

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[Soln] 2013 AIME I Problem 6

2013 AIME I 6. Melinda has three empty boxes and 12 textbooks, three of which are mathematics textbooks. One box will hold any three of her textbooks, one will hold any four of her textbooks, and one will hold any five of … Continue reading

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2013 AIME I Problem 6

2013 AIME I 6. Melinda has three empty boxes and 12 textbooks, three of which are mathematics textbooks. One box will hold any three of her textbooks, one will hold any four of her textbooks, and one will hold any five of … Continue reading

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[Soln] Variance Problem

With the assumption that prove the following inequality: (This problem was taken from this link.)

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[Hints] Variance Problem

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