There are two doors one to Heaven and one to hell. On these two doors are two guards, you don't know which is which. Only that one tells the truth and one tells lies. You can ask one question of one of the guards, to find which is Heaven. What would the question be:
" The door he indicates will be the one to ****.
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"Which door would the other guard say leads to Heaven?" The door he indicates will be the one to ****.