Question: Why I cannot solve this system of equations?

Maple experts,

(I am using Maple10)

I have the following system of equations, but I cannot obtain the solution. (I am able to solve by hand, but I want to verify and to solve the same sorte of equation but with more variables).

solve(    {z1s- p*y1s-(1-p)*y1=0, z2s- p*y2s-(1-p)*y2=0, z3s- p*y3s -(1-p)*y3= 0, y1s+y2s+y3s=1,   y1s-thetas1*(1- z1s-z2s) -(1-thetas1)*z1s=0 } , [y1s]);

What is my mistake?

Thanks in advance for the help.

Gabriel

 

 

 

 

 

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