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At 12:01, a virus is placed in a cell of a grid of unit equilateral triangles. Every minute, each cell with exactly one adjacent infected cell simultaneously becomes infected with a copy of the virus. (Two cells are adjacent if they share an edge.) The infected cells at 12:01, 12:02, and 12:03 are shown below. Let T be the number of infected cells at 12:05 and P be the perimeter of the infected region at 12:05. Find P−T.

 Nov 7, 2021
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Pls help quickly

 Nov 7, 2021

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