4Â Â Â Â Â Â Â 5Â Â Â Â Â Â Â 9Â Â Â Â Â Â Â 27 Â Â Â Â Â Â ? Â Â Â Â Â Â Â 723
4 × 2 – 3 = 5 5 × 3 – 6 = 9 9 × 4 – 9 = 27 27 × 5 – 12 = 123 123 × 6 – 15 = 723
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