Memory address of array

Please help me out. I'm totally confused about in this memory address.

    NSMutableArray *arr = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3", nil];

    NSLog(@"Address of array =  %p",&arr);
    NSLog(@"Array's element Address =  %p",arr);
    NSLog(@"Address 0th element %p",[arr objectAtIndex:0]);

    NSLog(@"Address of array =%lx",(long)&arr);
    NSLog(@"Array's element Address =  %lx",(long)arr);
    NSLog(@"Address 0th element %lx",(long)[arr objectAtIndex:0]);

    **Output**

    Address of array =  0xbfffd804
    Array's element Address =  0x866f340
    Address 0th element 0x4748
    Address of array =bfffd804
    Array's element Address =  866f340
    Address 0th element 4748

I'm getting this output but i'm confused with second and third output because according to my knowldge second and third output should be same. So please any one can explain me. Thanks in advance.