Challenge: How Many Terms in the Fibonacci Sequence Are Even (with n terms = 50)

Given the video lesson on Fibonacci. Modify the code to obtain the result of the following problem: Count the even terms of the Fibonacci sequence up to fib of 50 (e.g., 42 in the book, page 219). Self-assessment grid: if you solve it in < 5 minutes, score 10, if you solve it in 5 < t < 10 minutes, score 9, if you solve it in 10 < t < 20 minutes, score 8, if you solve it in 20 < t < 30 minutes, score 7. More than 30 minutes, score well done anyway... you're on the right track.