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Java i know that result will be 415. Can you explain how it works. step by...

Java 
i know that result will be 415. Can you explain how it works. step by step please. thanks
public static void whatsPrinted(int A[]) {
        for (int i=1; i<A.length; i++) {
            A[i]=A[i-1]*2+1;
        }
    }

    public static void main(String args[]) {
        int A[] = {12,3,8,9,7,11};
        whatsPrinted(A);
        System.out.println(A[A.length-1]);
    }
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