Question: 
Write a python function to find the sum of even numbers at even positions.


Model's Code:
def sum_even_and_even_index(arr, n):
    return sum(arr[i] for i in range(0, n, 2) if arr[i] % 2 == 0)



Sample Correct Code:
def sum_even_and_even_index(arr,n):  
    i = 0
    sum = 0
    for i in range(0,n,2): 
        if (arr[i] % 2 == 0) : 
            sum += arr[i]  
    return sum


Asserts:
assert sum_even_and_even_index([5, 6, 12, 1, 18, 8],6) == 30
assert sum_even_and_even_index([3, 20, 17, 9, 2, 10, 18, 13, 6, 18],10) == 26
assert sum_even_and_even_index([5, 6, 12, 1],4) == 12


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 270 of 974: 194/270 (71.85185185185186%): success