Dale M
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 7 Can you answer my son's fourth-grade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place? 6 Probability that the second-best player finishes second in a single-elimination tournament, given that better players always defeat weaker players? 5 What does expected value of sum of two discrete random variables mean? 5 In a triangle, prove that $a\cos A+b\cos B+c\cos C=\frac{8\Delta^2}{abc}$ 4 3-dimensional light up cube, # of rows/cols/diags in/on a 4 × 4 × 4 cube

### Reputation (2,376)

 +10 What does expected value of sum of two discrete random variables mean? +10 What is the meaning of “independent events ” and how can we logically conclude independence of two events in probability? +10 In a triangle, prove that $a\cos A+b\cos B+c\cos C=\frac{8\Delta^2}{abc}$ +10 Variance of a dice roll

### Questions (5)

 7 You are Johnny Depp 2! 3 Failure criteria for a collection of independent evolving discrete random variables 1 Absorbing state for a collection of random walks 1 You are Johnny Depp 3! 1 Probability distribution function of the length of an interval taken from a uniform probabilty distribution.

### Tags (91)

 104 probability × 144 8 probability-theory × 16 17 statistics × 24 8 calculus × 9 17 combinatorics × 20 8 dice × 6 13 recreational-mathematics × 10 7 elementary-number-theory × 3 9 probability-distributions × 21 7 trigonometry × 2

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