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Iterate through the given array and return the number of fours.

Write a function in Java that takes the int array arr and returns a new array with each number being doubled. Be sure to make use of...

Return the index of the last occurrence of a given number in an array. Return -1 if the number is not in the array.

A string is a palindrome if it reads the same forward and backward, with case insensitivity. For example, the words "mom", "dad", "Mom",...