Factorise `12a^(3) b^(3) - 3ab`.A. `3(a^(2) b^(2) - 1)`B. `3ab(a-b)`C. `3ab(2ab + 1) (2ab -1)`D. `3ab(a + 1) (b-1)`

Factorise `12a^(3) b^(3) - 3ab`.A. `3(a^(2) b^(2) - 1)`B. `3ab(a-b)`C.

1.	Factorise `12a^(3) b^(3) - 3ab`.A. `3(a^(2) b^(2) - 1)`B. `3ab(a-b)`C. `3ab(2ab + 1) (2ab -1)`D. `3ab(a + 1) (b-1)`
Answer» Correct Answer - C `12a^(3)b^(3) - 3ab = 3ab (4a^(2) b^(2) -1)` = `(3ab) ((2ab)^(2) - 1^(2))` `=3ab(2ab + 1) (2ab -1)`. Hence , the correct option is (c).

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