18 The probability that a husband and wife will still be living in 20 years is ¼ for the husband and is 1/3 for the wife. Calculate the probability: 1Of them both being alive in 20 years. 2The husband living in 20 years but not the wife. 3The husband and the wife dying before 20 years. Subject Probability Theory Events Probability Properties Probability Formula Combinatorics Probab. Addition Rule Multiplication Rule Conditional Probability Contingency Tables Tree Diagrams Law of Total Probability Bayes' Theorem Probability Problems 1 Probability Problems 2 Probability Problems 3 Site Math Formulas Word Problems Worksheets Arithmetic Algebra Geometry Trigonometry Analytic Geometry Calculus Statistics