which operation do you want me to do? addition? multiplication? division? subtraction (22 - 1) - 10 +13 = 24 21 - 10 + 13 = 24 11 + 13 = 24 24 = 24 So the numbers you can make out of those numbers are 10, 13, 22, and 1. But not 15. :P HOPE THIS HELPS
