freeCodeCamp opinion about this | Fibonacci challenge

Challenge: Sum All Odd Fibonacci Numbers |

Does designer(s) of this challenge expect me to

  • search and find Fibonacci formula (Fn = Fn-1 + Fn-2),
  • or solve it just with given numbers (0, 1, 1, 2, 3, 5 and 8)?

The instructions describe the Fibonacci series

Every additional number in the sequence is the sum of the two previous numbers.

You are expected to put that into code, and use it to complete the challenge