15. Given +s and y=(r+s), then when r = 1 and s= 1 will be A) 3 B) 2 0)1 DO E) none of these



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Answer


Ziqi
See first that . When and so . Similarly , so and our answer is D.
See first that   . When    
and so 
 


 




   
 .
Similarly 
 


 




   
 ,
so 
 
   and our answer is D.
4
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