Question 1170254
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For your info :   there is   NEITHER   " u "    NOR    " y "   NOR " t "   in your formula.



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It is very useful and even  NECESSARY  skill working online . . . 



Regarding &nbsp;z,  &nbsp;&nbsp;it is  &nbsp;&nbsp;&nbsp;&nbsp;z = {{{1/(1/m-1/n)}}} = {{{(mn)/(n-m)}}}.     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>