(1)の式の、2/10は何のことですか？ 教えてください🙇‍♀️

重要 例題 51 反復試行の確率 P の最大 10本のくじの中に2本の当たりくじがある。当たりくじを3回引くまで繰り 返しくじを引くものとする。 ただし,一度引いたくじは毎回もとに戻す。 n≧3とし, n回目で終わる確率をPとするとき [類 名古屋市大] (1) Pn を求めよ。 (2) Pn が最大となる n を求めよ。 ●基本 47,49 CHART & SOLUTION 確率の大小比較比 (2)Pが最大となるnの値を求めるには,Pn+1とPn の大小を比較すればよい。 確率の問題では,Pn が負の値をとらないことと, Pnの累乗を含む式で表されること をとり, 1との大小を比べるとよい。 Pn+1をとり,1との大小を比べる APP Pn+1 Pn から、比 TA KIH 解答 (1) 回目で終わるのは, (n-1) 回目までに2回当たりく じを引き, n回目に3回目の当たりくじを引く場合である。 OK よって 3800 P₁=₁-1 C₂ ( 10 ) ( 10 ) " Xx 22/8 \n-3 2 Czl n-3, 10年 -2 (1/3)^(1/1)(n≧3) (2) Pl={n(n-12(14)^2(1)}={(n-1)/n-2)(1/3)^2(1/2)} [大葉立共] _(n-1)(n-2) 2 4n 5(n-2) \5, Pn+1>1 とすると Pn すなわち 4n>5(n-2) 4n 5(n-2) (n−1)(n−2) ALBA ->1 これを解くと n <10 Pn+1−1 とすると n>10 Pn Pn+1 +=1 とすると n=10 Pn よって, 3≦x≦9のとき n=10 のとき 11≦n のとき DŽK P3<P₂<...<P9<P10=P11, P10=P11>P12>····.. したがって,P, が最大となるnの値は n=10,11 Pn<Pn+1, Pn=Pn+1, Pn>Pn+1 -40 (2) Pn+1 {(n+1)-1}{(n+1)-2} 2 '4\ (n+1)-3/1 \3 XI Pnのnの代わり に n +1とおいたもの。 5(n-2)>0であるから, 不等号の向きは変わら ない｡ P"の大きさを棒の高さで |表すと 増加 34 9 最大 12 1011 減少 n

英語の質問です。 "work late hours"「遅くまで働く」と言う表現に出会ったのですが、workは自動詞なのになぜwork till late hoursとは言わないのでしょうか？ 「今朝に」を"in this morning"とは言わずにinを省略して、"t... 続きを読む

鋳造の金属の断面組織についてで、最終凝固部の判断ってどのようにすれば良いのか教えて欲しいです。よろしくお願いします

「高校基礎」 第5文型のSVOCで、He makes everyone around him happy.のように、「動詞＋meなどの代名詞？＋形容詞」のようなものだけだと思ってたんですけど、この問題だと、代名詞？もないし、名詞の後にすぐ形容詞のinterestingがきて... 続きを読む

し (3) I found the C interesting. しなければならない。 0 Sが4がしだか分かる/思う。)となる conclusion of this book about Japanese culture SVOCだと 結論を面白いと思った。 私は日本文化についてのこの本のおもしろい 私は日本文化についてのこの本の結論を見つけた

America has gone a long way toward an appearance of classlessness.この文章のhas gone はhas beenじゃないんですか？has goneの方が良い理由はありますか？

ここの部分の答えを教えてください🙏

5 Fill in the blanks so that the two sentences have the same meaning.come on!! od 1) E p.199 1) a) I didn't want to get up this morning because of the cold. b) I didn't ( o) getting up this morning because of the cold. war guitso ard, talking / so 2) a) Why don't we have dinner at the new Italian restaurant this evening? ai i2) Ep.199 b) ( )( 4) gut. ) ( ) having dinner at the new Italian restaurant this evening? (id adi ogrebossa iDa diantapo s He wi 3) a) We can't predict where an accident will happen. ) ( (dosedad) (zbokti) b) ( will happen. a) It is worth your while to see the film. the film. b) The film ( edT (S eltaso ed T3 3) F p.199 (E ) predicting where an accident T BROT SHT pi) seeing. 4) Ep.1 eseadingTog (sd) broil you ei yod od za e te bu ad juoda list doidw asonson ) (

高一の不定詞の問題です。教えて下さい。できるだけベストアンサーにします。

各文の( )内から適当な語句を選びなさい. (1) The boy was watching a monkey (to eat / eat) an apple. (2) I would like you (to try/try) this new product. (3) Miki is taking a bath. I'll have her (call/to call) you back later. (4) Tom's boss made him (work/to work) "overtime yesterday. (5) We listened to the band (to play/play) their new song. (6) I asked my sister (to wake/wake) me up at six. 45 *「商品」 * 「時間外に

peaksがよくわかりません。文法的に説明して欲しいです

ら一つずつ選べ。 (1) Whether as a dream or reality, the idea of climbing to the top of the highest mountains of the world has a special appeal to mountain climbers. Two sets of mountains have become targets for the most serious climbers. The first set, called the Eight-thousanders (8000ers), consists of the 14 mountain peaks higher than 8,000 meters above sea level) (which are all in Asia even Summits, refers to the highest are Asia mountain on eacl ents of the world. (2) First, let us consider the 8000ers. Endeavors to climb such high Vt. 2 mountains understandably T 1/₁ 1 involve situations that are life-threatening volve 2 of the climbin Such difficulting 2

The first is Nevada〜の文が全体的にどこがS主語でどこがV動詞かわかりせん 後、その次の分のat the opposite end of the magnet scale のところが マグネットの度合いではその（ネバダの）対極に位置する　と訳してあるんです... 続きを読む

s also appear in Figures 1 and 2. The Vi first is Nevada, (where the high proportion of adult residents born out of state makes this state America's top magnet. New York is at the opposite V+ V₁ end of the magnet scale even though it is attractive to immigrants from other nations. The third extreme example is Texas, at the opposite end of the sticky scale from Alaska. Although it is a fairly weak magnet, Texas is the nation's stickiest state.

付箋の貼ってるところのadults bornのところがよくわかりません。born はbe動詞と一緒に使いませんか？

やや難 例題 次の文章はある報告書の一部である。 この文章と図を読み、問1~4 ] に入れるのに最も適当なものを,それぞれ下の①~④のうち から一つずつ選べ。 Magnet and Sticky: A Study on State-to-State Migration in the US (1) Some people live their whole lives near their places of birth, while V-F Q Vi others move elsewhere. A study conducted by the Pew Research Center (looked into the state-to-state moving patterns of Americans.) The study zens examined each state (to determine how many of their ad have moved there from othe these residents) are called "ma es of study also s both S investigated what percent of adults born in each state are still living there.) States high in these numbers are called "sticky" states. The study were magnet and sticky, while others were found that some states neither. There were also states that were only magnet or only sticky. (2) Figures 1 and 2 show how selected states rank 6n magnet and sticky scales respectively. Florida is a good example of a state that ranks high on both) Seventy percent of its current adult population was born in another state; at the same time, 66% of adults born in Florida are still living there. (On the other hand, West Virginia is neither magnet (only 27%) nor particularly sticky (49%). (In other words, it has few newcomers, and relatively few West Virginians stay there. Michigan is a typical example of a state which is highly sticky, but very low magnet, (In contrast, Alaska, which ranks near the top of the magnet scale, is the Vi least sticky of all states. S V VA (3) Three other extreme examples also appear in Figures 1 and 2. The first is Nevada, where the high proportion of adult residents born out of Svi CL V+ 9 V₁ state makes this state America's top magnet. New York is at the opposite end of the magnet scale even though it is attractive to immigrants from other nations The third extreme example is Texas, át the opposite end of the sticky scale from Alaska. Although it is a fairly weak magnet, Texas SV₁ is the nation's stickiest state.