2015 TJC MYCT Q1
2015 TJC MYCT Q1
5 marks
Others>BT|Others>CT
Find the set of values of \(a\) for which \(\sum\limits_{r=3}^{a}{(2r+a)}>{{a}^{2}}\).[5]
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Answer:Required set\(=\left\{ a\in {{\mathbb{Z}}^{+}}:a>3 \right\}\)
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