Twenty coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head? Choose the correct choice.
A) 2^19 B) 2^10 C) 3 * 2^8 D) 3 * 2^9 E) 3 * 2^10
Fix the third coin as H. The remaining 19 coins have 2^19 outcomes.   2^19
<result>A</result>
Twenty coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?