Possible Duplicate:
Conjunction fallacy
Alice is thirty-one years old, single, outspoken and very bright. She majored in finance. As a student she was deeply concerned with issues of discrimination and social justice, and participated in anti-nuclear demonstrations.
Consider the following two alternatives: (I) Alice is active in the feminist movement. (II) Alice works in a bank and is active in the feminist movement.
Which of the above two alternatives is more probable? Choose one of the following options.
A. (I).
B. (II).
C. Equally likely.