# Question

Show that the cross-product terms formed from (i· − ··), (·j − ··), and (ij − i· − ·j + X··) sum to zero, i = 1, 2, . . . a and j = 1, 2, . . . , b. For example, write

And sum each term in the inner summation, as grouped here, to get zero.

And sum each term in the inner summation, as grouped here, to get zero.

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