4, 5, 89 pattern is $$\left(4\times\ 5\right)\times\ 4+\left(4+5\right)=89$$
3, 4, 43 pattern is $$\left(3\times\ 4\right)\times\ 3+\left(3+4\right)=43$$
1, 2, 5 pattern is $$\left(1\times\ 2\right)\times\ 1+\left(1+2\right)=5$$
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