この問題でなぜ玉の取り出し方が6×5通りなのか教えてください。

(9 ) 邊が4個, 黒玉が2 個人入っている袋がある。 この袋から王を 1個取り則Ulモそれを袋にもどさ3にをもら う 」個取り出す。このとき, 黒主が少なくとも 1 個ほ袋に残る確率を求めよlただじ袋にAo でいるどのギドが 取り出されることも同様に確からしいもの 同2⑳8了MI間IIIBIII答の番号【9 1

解説の意味がわからないのでわかりやすく説明して頂きたいです！お願いします🙇‍♀️🙇‍♀️

高1・高2 スタンダードレベル数学IAIIB 第28講 式と証明(1) Q 問題 (G) 2)* の展開式で. xy*の項の係数は[ アイ ]である. XX 不正解! | | 「 解答 ア4 イO (1) (x+2の"の展開式の一般項は 。C,x5-7(2の"4C,275-7y7 2 はテー2 のときの項で. その係数は 。Cz22ニ40 である.

文章問題です わからないので解いてもらいたいです。 よろしくお願いします

10 ーーここCO い ー ここ 詞 Yuko is a junior high school student。 Last summer all the students in h 5 er had work experience for five days. They Worked at Iibraries。 stations, schools 。 演 San on.。 Yuko worked at *Aoba Nursery. School. She took care of three-year -old d語 $0 Ten. Before working she thought that the work at a nursery school was jnst to り with small children and very easy. But after she began to work, She found ta り she WaS Wrong. 由 ヵOn the frst day。Yuko tmied to communicate with the children in the Class. She went to a boy who was reading a picture book and said, “Lets read the book together* He looked up at her but didnt say anything. Soon he looked down and starteq 9 re the book again。 Then she asked, What are you reading? IS the book interesingy He looked up at her again、 This time she smiled at him. Suddenly he ran away from her. She Was very DSG "What did I do っDid 1 do something bad to him?" After lunch。 Yuko was very shocked again when she saw the room. There was 3 1 / wher | because the children couldnt eat and drnk very well Jot of energy.' boy came to her and si0

文章問題です わからないので解いてもらいたいです。 よろしくお願いします

10 ーーここCO い ー ここ 詞 Yuko is a junior high school student。 Last summer all the students in h 5 er had work experience for five days. They Worked at Iibraries。 stations, schools 。 演 San on.。 Yuko worked at *Aoba Nursery. School. She took care of three-year -old d語 $0 Ten. Before working she thought that the work at a nursery school was jnst to り with small children and very easy. But after she began to work, She found ta り she WaS Wrong. 由 ヵOn the frst day。Yuko tmied to communicate with the children in the Class. She went to a boy who was reading a picture book and said, “Lets read the book together* He looked up at her but didnt say anything. Soon he looked down and starteq 9 re the book again。 Then she asked, What are you reading? IS the book interesingy He looked up at her again、 This time she smiled at him. Suddenly he ran away from her. She Was very DSG "What did I do っDid 1 do something bad to him?" After lunch。 Yuko was very shocked again when she saw the room. There was 3 1 / wher | because the children couldnt eat and drnk very well Jot of energy.' boy came to her and si0

(5)です。 who がダメな理由は分かりますがそれ以外はどうやって絞ればいいんですか？

2 ーーーーーーーーーーーーーーーーーー ](5) This js the (WhO7AWIiBH醒諸/ made yesterday. へ 「 (6) I want to eat the cake (this / who / which / it has fruit

ここの部分がイコールになる理由が分かりません。教えて下さい(_ _)

介二あるるり のとき |デーマ だから ( 生の |三| レ 且語より 2 (の三 ーァ十1 (0ミァく1)

ツ を求める考え方を教えてほしいです！ 予想でも良いのでアンサーお願いします！🙇🏻‍♀️ ちなみに答えは0番です。

(2〕 g>0 とし, 2次関数/(x) は 0ミァgo の範囲で /(*)有0, 6テ の舌囲で 7(>) 6 を洪たすとする。また, />0 とし. 曲線 ッー(テ) の 0ミエるたの部分 および2直線 *=0, ャディ で囲まれた図形の面積を S(/) とする まれねた部分が複数頒ある場合はそれらの面積の利を S(/) とする。 *幸 * ただし 財 1) 0</<o のとき sの=/し[も] なぐまのとき sの=/[ッ]w+/[タ ]み である。 したがって 0</<Z のとき S(ひ=【チ 6く#のとき SO2=【 ッッ/| となる。 [ラッ1 [タタ1[チ1しッ |にきてはまるものを, のる au Ls二[ン1 [3 ] の人 ⑲ (>) ⑩ (-/Gぶ) @⑨ /⑦) @⑨ {-アG)) - [| チ | [ッ]の交 @ 7の 0 = _@ /(り @ -/ひ0 (数学IL・数学B 第2問は次ページに続く)

シグマのところの計算を教えてください！

何故こうなるのか教えてください。お願いします🤲

4番の解説をお願いしたいです！