By Alex Chik in GeoGebraTube.
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Key Stage 4 (Senior Secondary) > 4.1 Number & Algebra 數與代數 > Arithmetic and geometric sequences and their summations 等差數列和等比數列及其求和法 >
Key Stage 4 (Senior Secondary) > 4.1 Number & Algebra 數與代數 > Arithmetic and geometric sequences and their summations 等差數列和等比數列及其求和法 >
Triangle Numbers and Sum of Odd Numbers 三角形數及首n個奇數之和
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