The sequence of fn is given as , f1=1,f2=3,fn+2=fn+fn+1, for n>1 . How many even terms are between the first 2020 terms of that sequence?
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Fn = Fn - 1 + Fn - 2 F3 = F2 + F2 = 3 + 1 = 4 F4 = F3 + F2 = 4 + 3 = 7 F5 = F4 + F3 = 7 + 4 = 11. Here is your answer
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answer is 674
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