Question

There are 7 groups in a picnic who has brought their own lunch box, and then the 7-lunch box are exchanged within those groups.
Determine the number of ways that they can exchange the lunch box such that none of them can get their own?
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Answer 1

Answer:

5033

Explanation:

As they have 7 lunch box ,after distributing it will come 7×6×5×4×3×2×1=5040 ,from which 7 is subtracted it will be 5033