Question

A Street has 13 houses in a row as shown in the figure. Some residents in the first
house tested positive for COVID-19. The virus spreads in two ways: it can spread to
the next house, or jump directly to the third house. Residents of house number 2 can
get infection in only one way, the house number 3 in two ways, the house number 4
in 3 ways, the house number 5 in 5 ways and so on. If the virus only progresses from
Left to Right direction, in how many ways can the residents of the house number 13
get infected?​

Answer 1

Answer:

its not important that the 13th house get covid

if they get covid once then they have antibodies

or if they have immunity they will save

Answer 2

Answer - Just get vaccines