UKMT Intermediate Challenge-I

Ria bakes six raspberry pies one after the other, numbering them 1 to 6 in order, with the first being number 1. Whilst she is doing this, her children occasionally run into the kitchen and eat the hottest pie. Which of the following could not be the order in which the pies are eaten?

This problem is not original.This problem is part of this set.

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