Part A

Given that the Sun's lifetime is about 10 billion years, estimate the life expectancy of a 0.1-solar mass, 0.010-solar luminosity red dwarf.

Express your answer using one significant figure.

Part B

Estimate the life expectancy of a 6-solar mass, 30-solar luminosity star.

Express your answer using one significant figure.

Part C

Estimate the life expectancy of a 20-solar mass, 2000-solar luminosity blue giant.

Express your answer using one significant figure.

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