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The trapezoidal number is the number of pebbles you get when arranged in a two-row trapezoid with pebbles on the bottom row and pebbles on the row above. Find a concise formula for the trapezoidal number.

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MCQs on Elementary Number Theory.


The<br><img src='https://www.fatskills.com/images2/GradExams/E81AC90D-E432-4422-BF7B-A6EA9362EE3E.png' height='19' width='25'/> trapezoidal number is the number of pebbles you get when arranged in a two-row trapezoid with<br><img src='https://www.fatskills.com/images2/GradExams/0EFC40A6-D14C-420D-BA3F-92D03E7B509E.png' height='10' width='11'/> pebbles on the bottom row and<br><img src='https://www.fatskills.com/images2/GradExams/186299A6-2951-4784-A176-F7B6D1085C0C.png' height='15' width='45'/> pebbles on the row above. Find a concise formula for the<br><img src='https://www.fatskills.com/images2/GradExams/E81AC90D-E432-4422-BF7B-A6EA9362EE3E.png' height='19' width='25'/> trapezoidal number.





 
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