Answer:

192

Step-by-step explanation:

Given that there were 3 identified virus cells at the start and it doubles it cell number.

Then, the geometric sequence will be 3, 6, 12, 24, 48, 96, 192, ...

It is also given that the virus doubles every 30 minutes and we are tasked to find out how many viruses are there after 3 hours.

Observe that: 3 hours = 180 minutes.

Then, 180/30 = 6 + 1 = 7 so we are finding for the 7th term in the geometric sequence which is 192 cells.

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~~DeanGD20

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