When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 4 times, what is the probability that it will land twice on heads and twice tails? Choose the most appropriate option:  A) 1 / 8  B) 1 / 4  C) 1 / 16  D) 1 / 32  E) 1 / 2

Rationale: must be twice on heads and twice on tails 1 / 2 * 1 / 2 * 1 / 2 * 1 / 2 = 1 / 16 answer : c
Answer: C