1.

`|(1,x,y),(1,x+y,y),(1,x,x+y)|`का मान ज्ञात कीजिए।

Answer» `|(1,x,y),(1,x+y,y),(1,x,x+y)|=|(1,x,y),(0,y,0),(0,0,x)|`
`{:((R_(2)toR_(2)-R_(1)),(R_(3)toR_(3)-R_(1))):}`
`=1|(y,0),(0,x)|=xy`


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