Hi,
This question tests the knowledge of 'Independent events'. If two events A and B are independent; the probability of A and B occurring simultaneously equals the probability of A times the probability of B.
In this case, when one person is chosen from the class, let the events A, B and C be defined as follows
A - Event of choosing a fair person; P(A) = 0.4
B - Event of choosing a rich person; P(B) = 0.2
C - Event of choosing a girl; P(C) = 0.25
Hence, P(choosing a fair complexioned - rich - girl) = [spoiler]P(A) times P(B) times P(C) = 0.4 times 0.2 times 0.25. Hence, 0.02[/spoiler].
Hope this helps.
Naveenan Ramachandran
4GMAT, Dadar(W) & Ghatkopar(W), Mumbai
