1. Factorise the expression by taking binomial commonly out

3 h^{2} (23 h - 1) - 23 h + 1

$(23 h - 1) (3 h^{2} - 1)$
$(23 h + 1) (3 h^{2} + 1)$
$(23 h + 1) (3 h - 1)$

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