CBSE Class 11-science Answered
FIND
Asked by | 03 Oct, 2008, 07:33: PM
Expert Answer
series can be written as (1-1/3) +(1-1/9) + (1-1/27) +....................................n terms
taking all 1 one side we get for n terms n - (1/3 +1/9 +1/27 +1/81...............n terms ) which is a GP with first term 1/3 and r =1/3
so sum is n - (1/3){1-(1/3)n}/ 1-1/3
which gives B as correct answer
Answered by | 16 Dec, 2008, 08:58: PM
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