CA CPT June 2015 Question Paper Quantitative Aptitude for online practice

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Question : 18 of 50

Marks: +1, -0

1+11+111+………………….n terms:

$1/{27}[10^{n+1} – 9n – 10]$
$[10^{n+1} – 9n – 10]$
$1/81[10^{n+1} – 9n – 10]$
None of these

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