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Question Number 9278 by j.masanja06@gmail.com last updated on 28/Nov/16

$$\mathrm{represent}\mathrm{in}\mathrm{sigma}\mathrm{notation}$$$$-1+4-9+16..................$$

Commented by FilupSmith last updated on 28/Nov/16

$$=\underset{n=1}{\sum ^{\mathrm{\infty }}}{(-1)}^n{n}^2$$

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