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2. Factorise the expression by taking binomial commonly out

9 m^{2} (3 m - 1) - 3 m + 1

$(3 m - 1) (9 m^{2} - 1)$
$(3 m + 1) (9 m^{2} + 1)$
$(3 m + 1) (9 m - 1)$

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