Respuesta :

Answer:

public int sum(ArrayList array) {

       int total = 0;

       for(int i=1;i<array.size();i+=2){

             total += array.get(i);

       }

       return total;

}

Explanation:

Step 1 define the method and variables

public int sum(ArrayList array) {

       int total = 0;

Step 2 loop over the array index from 1 to array size step 2 (Keep in mind if you have step 2 beginin in 1 you loop the odd index

for(int i=1;i<array.size();i+=2){

Step 3 Acumulate the total of data with odd index

total += array.get(i);

Step 4 Return de total

return total;

Example

If you use the array [4,6,2,10]

you get as total the sum of 6 and 10 that correspond to the index 1 and 3 respective

total = 16

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