1. The problem statement, all variables and given/known data The question is stated in the picture attached. 3. The attempt at a solution I used a slightly different method, by making use of recurrence relations through integration by parts: Jn = (2/2n+1) Jn+1 Jn = [1x3x5x....]/[2n] √∏ = [2n-1]! / [2n-1 * (n-1)! ] = (2n)! / (2n * n!) But the answer had 4n instead at the bottom... Not sure where I went wrong.