1+3+9+27+..............................................................................up to infinity??????? find sum

Dear Aditya,

This is an infinite G.P. with common ratio=3.

      So sum= a/(1-r) ; a= first term.

  But this is applicable only, when r belongs to (-1,1).

        Here sum is 'infinite', as infinite no. of terms ad up.

        Good Luck!!

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