Zeal coaching

Question

Consider the array A[4,7,11] of integers of size 4 bytes per elements how many elements of array are strictly stored  between the element ofA[ 2, 3, 9] and the element A[ 3, 1, 6]  assume the index start from A[ 1, 1, 1]

Comments

A is 3 Dimensional array, which have 4 2D array, where each 2D array has 7 1D array, and each 1D array has a single element.

If it is correct then, I think  A[ 2, 3, 9]  seems invalid to me, because the third argument exceeding the limit.