Question: what is *(ptr-3)-3?? i understand 30, 19, 8. However, the last one is the problem. ptr-3 means the address before 10, but there is not

what is *(ptr-3)-3??
i understand 30, 19, 8. However, the last one is the problem.
ptr-3 means the address before 10, but there is not number before 10.
Help me please
3. (4 pt) What will the following program display? int a[6] = {10, 20, int ptr = &a [2] ; for int 30; j = 0; j > -4 ; j--) cout
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