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package com.examplehub.maths;
/** https://en.wikipedia.org/wiki/Fibonacci_number */
public class Fibonacci {
   * Get nth item of fibonacci sequence.
   * @param n the nth
   * @return the nth item of fibonacci sequence.
  public static int fibonacci(int n) {
    if (n < 0) {
      throw new IllegalArgumentException("n < 0");
    int first = 0;
    int second = 1;
    for (int i = 1; i <= n; ++i) {
      int c = first + second;
      first = second;
      second = c;
    return first;

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