Fib

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function fib(num1, num2){ var n = num1 + num2; var result = 2; while(n <= 4000000){ num1 = num2; num2 = n; n = num1 + num2; if(n % 2 == 0){ result += n; console.log(n); } } return result; } console.log(fib(1, 2));
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