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                                    If Sr denotes the sum of the infinite geometric series whose first term is r and common ratio is 11+r, where r∈N, then the value of 10∑r=1S2r is | 
                            
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Answer»  If Sr denotes the sum of the infinite geometric series whose first term is r and common ratio is 11+r, where r∈N, then the value of  10∑r=1S2r is  | 
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