$$\(20 E=n^{2}+n+5\)$$ (a) Work out the value of $$\(E\)$$ when $$\(n=3\)$$ $$\[ E= \]$$ (1) Ali thinks that the value of $$\(E\)$$ will be a prime number for any whole number value of $$\(n\)$$. (b) Is Ali correct? You must give a reason for your answer. (2)

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