Mathematics, 09.10.2019 16:40, jorozco3209

Year .. invention

1807.. steamboat
1825 ..photography
1837.. telegraph
1846.. sewing machine
1869.. hydroelectric power
1876.. telephone
1879.. light bulb
1888 ..rabies vaccine
1890 ..diesel engine
1897 ..airplane

in mr. tarkiainen’s history class, each student chooses two of the topics listed in the chart above for their papers. how many different pairs can juliana choose?

10
45
30
90

Answers: 2

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Year .. invention

1807.. steamboat
1825 ..photography
1837.. telegraph <...