Factorise the expression.
$10 a b + 4 a + 5 b + 2$

(a + 1) (5 b + 2)

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(2 a + 1) (b + 2)

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(2 a + 1) (5 b + 2)

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(2 a + 1) - (5 b + 2)

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Solution

The correct option is C $(2 a + 1) (5 b + 2)$
$10 a b + 4 a + 5 b + 2$
$= 2 a (5 b + 2) + (5 b + 2)$
$= (5 b + 2) (2 a + 1)$

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