Question 955580
{{{r^2s^(-3)t^(1/2)=0}}}

{{{r^2(1/s^3)sqrt(t)=0}}} ...since {{{s}}} in denominator, we have to exclude {{{s=0}}} because solution will be {{{r^2(1/0^3)sqrt(t)=infinity}}} 

so, solution will be {{{0}}} only if 
{{{r = 0}}},   {{{s<>0}}}
and
{{{t = 0}}}, {{{s<>0}}}

so, answer is:I and III only


which of the following CANNOT be true: II only (because denominator {{{s = 0}}})