The image is a close-up, overhead shot of an open book, likely a textbook, lying on a surface with a distinctive checkered pattern. The text on the pages is mathematical, with equations and numbered questions. On the right page, question (11) presents a summation: $\sum_{r=1}^{n} r(r+4) = \frac{1}{6}n(n+1)(2n+13)$. Question (12) proves by induction that $\sum_{r=1}^{n} r(2^{r-1}) = 1 + (n-1)2^n$. Below this, question (13) asks to "Prove by induction that $\sum_{r=1}^{n} r\{2n - (2r - 1)\} = \frac{1}{6}n(n+1)(4n-1)$." The text also states, "V positive integers n. Hence or otherwise determine the sum of the series $\sum_{r=1}^{n} r\{2n - (2r-1)\}$." The bottom of the right page shows some additional text including "Practic" and "1. Eval" and "2. Eva". The checkered surface beneath the book appears to be a placemat or a tablecloth. There is no visual information in this image that would allow for any determination of its location within the city of Jalingo, Nigeria, or any other specific geographical location. in Jalingo, Nigeria

$The image is a close-up, overhead shot of an open book, likely a textbook, lying on a surface with a distinctive checkered pattern. The text on the pages is mathematical, with equations and numbered questions. On the right page, question (11) presents a summation: $\sum_{r=1}^{n} r(r+4) = \frac{1}{6}n(n+1)(2n+13)$. Question (12) proves by induction that $\sum_{r=1}^{n} r(2^{r-1}) = 1 + (n-1)2^n$. Below this, question (13) asks to "Prove by induction that $\sum_{r=1}^{n} r\{2n - (2r - 1)\} = \frac{1}{6}n(n+1)(4n-1)$." The text also states, "V positive integers n. Hence or otherwise determine the sum of the series $\sum_{r=1}^{n} r\{2n - (2r-1)\}$." The bottom of the right page shows some additional text including "Practic" and "1. Eval" and "2. Eva". The checkered surface beneath the book appears to be a placemat or a tablecloth. There is no visual information in this image that would allow for any determination of its location within the city of Jalingo, Nigeria, or any other specific geographical location.$

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Jun 28, 2026, 8:50 PM

Jalingo, Nigeria

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The image is a close-up, overhead shot of an open book, likely a textbook, lying on a surface with a distinctive checkered pattern. The text on the pages is mathematical, with equations and numbered questions. On the right page, question (11) presents a summation: $\sum_{r=1}^{n} r(r+4) = \frac{1}{6}n(n+1)(2n+13)$. Question (12) proves by induction that $\sum_{r=1}^{n} r(2^{r-1}) = 1 + (n-1)2^n$. Below this, question (13) asks to "Prove by induction that $\sum_{r=1}^{n} r\{2n - (2r - 1)\} = \frac{1}{6}n(n+1)(4n-1)$." The text also states, "V positive integers n. Hence or otherwise determine the sum of the series $\sum_{r=1}^{n} r\{2n - (2r-1)\}$." The bottom of the right page shows some additional text including "Practic" and "1. Eval" and "2. Eva". The checkered surface beneath the book appears to be a placemat or a tablecloth. There is no visual information in this image that would allow for any determination of its location within the city of Jalingo, Nigeria, or any other specific geographical location.

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