PrepBytes Interview Puzzle Series: Puzzle #3

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[anandkumar.]

just one attempt required !!
let 1--apple, 2--orange, 3--orange+apple
now let us choose the first crate to open
that will either have Orange in it or Orange and apple
let it has orange
so we'll change its label to orange, and for 2-orange+apple and 3-orange
using the fact that crates were labelled incorrectly :)

[kritikasachdeva]

1 attempt only !
suppose we check crate 1, remove its label and have to replace it with the label on crate 2, then the replaced label(which was initially on crate 1) will be for crate 3, and crate 3's initial label will be put on crate 2 (since we know that all labels are surely incorrect initially, so we will change all of them.)