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Mathematics Senior High

白チャート数学ⅡB「数列」 赤線の四角部分が分からない箇所です。 赤四角の直前の式、 p_n+1-1/2=3/4(p_n-1/2)は分かりましたが、 p_1(=初項)の求める式が 赤四角の様になる理由が分かりません。 すみませんが、教えて下さい。

確率と漸化式 発展例題 192 0 1,2,3,4,5,6,7,8の数字が書かれた8枚のカードの中から1枚取り出 もとに戻すことを同を回行で、数字のカーが取り 出される回数が奇数である確率をPとするとき, n をnの式で表せ。 [産業医大 ] CHART 確率の問題 & GUIDE 2回目と(n+1)回目に注目して漸化式を作る nとn+1の関係を求めるために, まず (n+1) 回目の試行で8のカードが奇数回取 り出されるのはどういう場合かを考える。”回の試行で数字8のカードが取り出され る回数が偶数である確率は 1-Pr...... 解答 (n+1)回の試行で, 8 のカードが奇数回取り出されるのは, 次| の [1] または [2] の事象である。 [1] "回の試行で8のカードが奇数回取り出され,n+1 回目 1回の試行で8のカード に8のカードが取り出されない が取り出されない確率は [2] n回の試行で8のカードが偶数回取り出され,n+1回目 7 8 に8のカードが取り出される [1] の確率は pnx- 8 7 [2] の確率は(1-pm)×1/2 8 [1], [2] の事象は互いに排反であるから 3** = = = Pa+ / - (1 - Di) = ²/ P₂+ / 3 3 1 Pnt1= すなわち ←確率の加法定理。 8 8 4 8 1 3 1 1 1 1 3 3 Pn+1 また pi Pn c=act/1/2 を解くと -c+· 2 4 2 8 2 8 4 1 3 3 って、数列{ bo-2121 } は初項-2122,公比 の等比数列である 2 8 4 1 から 3 3 n-1 pm 2 8 4 したがって 3 \n Pn= - 1/2 - 1/2 ( ²³ ) ² = 1 + (1 - ( ²3 ) ) 4 EX 92 数直線上を原点から出発し、次の規則で移動する点Pがある。 1個のサイコロを投げて、出た目が5以上の場合は,正の向きに2進み, 出た目が4以下の場合は、正の向きに1進む。 サイコロをn回投げたとき,Pの座標が偶数になる確率をaとする。 am n の式で表せ。 [類 福井大 475 3章 発展学習

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English Senior High

英語の読解問題です。 5.7.8はわかりましたが、6がわかりません。 どなたか教えていただけないでしょうか? また、5.7.8は合っているでしょうか。 Agatha O'Connell Marketing Department I would like to repo... Read More

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Resolved Answers: 1
English Senior High

全部じゃなくていいです!教えてください🙇‍♀️

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Resolved Answers: 1