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The average income of a group of persons...

The average income of a group of persons is `vec x` and that of another group is `vecy.` If the number of persons of both group are in the ratio `4 : 3,` then average income of combined group is:- (1) (vec x + vec y)/7` (2) `(3vec x + 4 vec y)/7` (3) `(4 vec x + 3vec y)/7` (4) Non of these

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