Pascal's triangle
(mathematics) A geometric representation of the binomial coefficients in a triangle, each entry being the sum of the two entries above.
an escape from prison.
(nonstandard) Rare spelling of two-thirds.
A slot in a wall or door through which mail is delivered.
今日の授業では、二項係数を三角形状に配列した表を調べ、それを使って二項展開の係数を計算しました。
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