freeCodeCamp

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id	challengeType	title
5900f4571000cf542c50ff6a	5	Problem 235: An Arithmetic Geometric sequence

Description

Given is the arithmetic-geometric sequence u(k) = (900-3k)rk-1. Let s(n) = Σk=1...nu(k).

Find the value of r for which s(5000) = -600,000,000,000.

Give your answer rounded to 12 places behind the decimal point.

tests:
  - text: <code>euler235()</code> should return 1.002322108633.
    testString: assert.strictEqual(euler235(), 1.002322108633);

function euler235() {
  // Good luck!
  return true;
}

euler235();

// solution required