i am building a thing to launch one of 10 random soda cans. they will be released by a trunk latch which will release them and a spring will pull them quickly up hopefully going about 3-4 feet in the air. the question i have is that i want them to be random or seemingly random. a pattern would be fine as long as i could change it easily buy switching wires of the 10 throwers they will be set up as such the numbers represent an individual launcher 1---10ft---2---10ft---3---10ft---4---10ft---5 6---10ft---7---10ft---8---10ft---9---10ft---10 i need to figure out some sort of a circuit for them that will launch randomly 1 of the 10 then take it of the random mix for a total of 5 launches. it is OK if it throws 1 and then 6 but obviously it can not throw number 1 two times. i am not very good at electronics and i do not know what i need to do this. so much so that i don't even know what i need to Google to find parts. some help on a direction to move to would be very helpful.