The sequence 1,1,2,3,5,8,13,21 has the property that each term (starting with the third term) is the sum of the previous two terms. How many of the first 1000 terms are divisible by 4?
Every 6th term is divisible by 4. So:
1,000 / 6 ==166 terms are divisble by 4.
Thank you so much :)