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Data Step - by groups
Question 1 of 5


When the code below is executed on the dataset shown in screenshot, how many number of times the value of last_sex will be 1?

proc sort data=sashelp.class out=class01 ;

   by sex;

run; 

data class02;

    set class01;

    by sex;

    first_sex=first.sex;

    last_sex=last.sex;

run;





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