When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land twice on heads and once on tails? Choose one.
A) 1 / 16
B) 1 / 3
C) 1 / 6
D) 1 / 2
E) 1 / 8

Rationale: "must be once on twice and once on tails 1 / 2 * 1 / 2 * 1 / 2 = 1 / 8 answer : e"
Answer: E