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Quel résultat retourne la commande suivante ?
paste(1:3, c("father", "mother", "child"), sep = "_" )
[1] "1_father" "2_mother" "3_child"
[1] "1_father_2mother_3child"
[1] "father_1" "mother_2" "child_3"
[1] "1_father,2_mother,3_child"
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