In each of 1 through 6, determine whether the method of separation of variables can be used to replace the given partial differential equation by a pair of ordinary differential equations. If so, find the equations.tuxx + xut = 0

Week1 11.3-11.4 Combinations, Fundamentals of Probability Spring 2016 Permutation vs Combination Permutation Combination Order MATTERS!! DOES NOT MATTER Formula n ! nP r n ! nPr▯ nCr▯ ▯ ▯n▯r ! r ! r ! n▯r ! Permutation or Combination 1. How many different 4-letter passwords can be formed from the letters A, B, C, D, E, F, and G if no repetition of letters is allowed 2. 50 people purchase raffle tickets. 3 winning tickets are selected at random. In how many different ways can the prizes be awarded