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Question Number 97019 by bshahid010@gmail.com last updated on 06/Jun/20

Commented by PRITHWISH SEN 2 last updated on 06/Jun/20

$$(2+2.8+2.8^2+....+2.8^{29})+(4+4.8+4.8^2+...+4.8^{29})$$$$-(8+8.8+8.8^2+...+8.8^{29})$$$$\mathrm{now}\mathrm{it}\mathrm{is}\mathrm{a}\mathrm{combination}\mathrm{of}3\mathrm{G}.\mathrm{P}\mathrm{with}\mathrm{common}$$$$\mathrm{ratios}\mathrm{of}8$$$$=-\frac{2}{7}(8^{30}-1)$$

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