exam Maths Puzzle Numerical Ability

Is (10+7)+4=10+(7+4) associative?

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exam Other Question

Find the product: (x - 1)(x-2)(x + 3) What type of function would generate the sequence tn=(1.5,5,8.5,9,3.5,-11,...)?
I think the answer is exponential. Can someone please confirm this for me ?