An array is said to be dual if it has an even number of elements and each pair of consecutive elements sum to the same value. Return true if the array is dual, otherwise return false.

def is_dual( array):

   if len(array) % 2 == 0:

       count = 0

       for i in range(0, len(array)//2, 2):

           if array[i] + array[i+1] == array[0] + array[1]:

               count += 1

       if count == len(array)//2:

           return True

       else:

           return False

Explanation:

The python program defines a function called is_dual that accepts an array parameter and check if the array is dual. If it meets the condition, the function returns true but returns false when the array is not dual.

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

~

answer; peter zenger;