1.1 KiB
1.1 KiB
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
5900f4551000cf542c50ff67 | Problem 232: The Race | 5 | 301876 | problem-232-the-race |
--description--
Two players share an unbiased coin and take it in turns to play "The Race".
On Player 1's turn, he tosses the coin once: if it comes up Heads, he scores one point; if it comes up Tails, he scores nothing.
On Player 2's turn, she chooses a positive integer T
and tosses the coin T
times: if it comes up all Heads, she scores 2^{T - 1}
points; otherwise, she scores nothing.
Player 1 goes first. The winner is the first to 100 or more points.
On each turn Player 2 selects the number, T
, of coin tosses that maximises the probability of her winning.
What is the probability that Player 2 wins?
Give your answer rounded to eight decimal places in the form 0.abcdefgh .
--hints--
theRace()
should return 0.83648556
.
assert.strictEqual(theRace(), 0.83648556);
--seed--
--seed-contents--
function theRace() {
return true;
}
theRace();
--solutions--
// solution required