1.

Find the sum to n term the series : (x+y)+(x^(2)+xy+y^(2))+(x^(3)+x^(2)y+xy^(2)+y^(3))+…..

Answer»


ANSWER :`=(1)/(X-y)[(x^(2)(x^(N)-1))/(x-1)-(y^(2)(y^(n)-1))/(y-1)]`


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