freeCodeCamp

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id	challengeType	title
5900f4e01000cf542c50fff2	5	Problem 371: Licence plates

Description

Oregon licence plates consist of three letters followed by a three digit number (each digit can be from [0..9]). While driving to work Seth plays the following game: Whenever the numbers of two licence plates seen on his trip add to 1000 that's a win.

E.g. MIC-012 and HAN-988 is a win and RYU-500 and SET-500 too. (as long as he sees them in the same trip).

Find the expected number of plates he needs to see for a win. Give your answer rounded to 8 decimal places behind the decimal point.

Note: We assume that each licence plate seen is equally likely to have any three digit number on it.

Instructions

Tests

tests:
  - text: <code>euler371()</code> should return 40.66368097.
    testString: assert.strictEqual(euler371(), 40.66368097);

Challenge Seed

function euler371() {
  // Good luck!
  return true;
}

euler371();

Solution

// solution required

1.2 KiB Raw Blame History