Re: Balls are drawn \" without replacement\"
If it's balls are kept out after each draw, it would just be solving algebra.
B = Number Blue Balls
N = Total Balls
First draw: P(Blue ball) = B/N
2nd draw: P(Blue ball) = B-1/N-1
Multiply all draws and set equal to .5
1 Equation, 2 variables - start with N=6 and "trial and error" until the equation balances. Or use Solver in Excel.
|