Viruses spread from person to person mainly in droplets that fly out when you cough or
sneeze. Some types of viruses, like the common cold & flu follow sequences. The centers for
disease control and prevention are monitoring the growth of virus. One strand of the virus
identified as strand A and the other strand is identified as strand B.

Strand A no. of days 1 2 3 4 5
no. of infected people 1 5 9 13 18

Strand B no. of days 1 2 3 4 5
no. of infected 1 3 9 27 81 people


1. Which of the following strands represent arithmetic sequence? Geometric sequence?
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2. How many people will be infected after a week?
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3. Which strand of virus spread more rapidly?
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4. How to reduce the risk of catching or spreading the virus?
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