If the order of matrices A, B and C are `3 xx 4, 7 xx 3 " and " 4 xx 7` respectively, then the order of (AC) B is _____.

If the order of matrices A, B and C are `3 xx 4, 7 xx 3 " and " 4 xx 7` respectively, then the order of (AC) B is _____.
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If the order of matrices A, B and C are `3 xx 4, 7 xx 3 " and " 4 xx 7` respectively, then the order of (AC) B is _____.
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