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数学 中学生

計算で求める場合の数について質問です。 順列については理解できたのですが、組み合わせの公式が全くわかりません。 ここに全く解説がないのでどなたか詳しく教えてください。お願いします🤲

場合の数 ェーー 本究をミテメー 計算で求める場合の数 | () A, B, C, Dの4個を順に 1 列に並べる場合の数 | (考え方〕 ・1個目を選ぶ選び方は4通り。 | ・2個目を選ぶ選び方は, 残りの3個から選ぶから3通り。 ・3個目を選ぶ選び方は, 残りの2個から選ぶから2通り。 通り 4X3X2メ1三24(通り) | 合 (1 ・ 4個日を選ぶ選び方は, 残りの1個から選ぶから1通り。 すべての場合の数 (2 AB D の4 個から同時に 2 個を取り出す場合の数 A=ニーーーデB ・4個から2個を順に選ぶ選び方は。4X3(通り)。 ・ (4X3) 通りのうちには, (A, B) の選び方と(B, A) | 4x る 」 1 4 ュっラテデ6 (通り) の選び方が別のことがらとして数えられていて 2ペ1 (9 (2 X1) ずつ重複して数をられていることになる。 順列.……異なる z 個のものからヶ個を取って並べる場合の数は, 2このテー のee (一1 (pーの……(ぬーテ1)通り 組み合わせ……異なる ヵ 個のものから ヶ個を取って組み合わせる場合の数は, な(一1) (ヵー2)……(gーテキリ 1) ⑦ー ) 2X3X2XT SN 個 にっ ーー ー = 了ゅ具体的な数をあてはめて, 公式を確認しよう| S

解決済み 回答数: 1
英語 中学生

Aはイ Cはア Eはウ となりました。理由を教えてください。

4| 次の英文を読み、後の問いに答えなさい。 ited because ( A ) very excited m September 2018, all of Japan 時 和 Osaka *beat the top player women's tennis. The Japanese tennis DIayG 開間記寺0DGUBLI ( B ) the worlq, Serena Williams, and MA oo Tournament。 Naomi is the first Japanese DIayGr ( singles tournament. 7.、 Her m NEの 2SBDOPPSITUOS2K2EIBDGUWWOU October 16, 1997. Her mother Tamaki Osaka, is Japanese, and her father Leom 8 8 1 When Naomi was three years old, she moved to America with her family. Her name is Japanese, and she is both Japanese and Americar. 則NS Ne jived im America( D )she was three years old, ①なおみは日本語より蔽語を上に 話すことができます。 K Tm America, her father began to teach tenrus to Naomi and her sister。Mari. He chose to put Naomi in the *Japan Tennis Association, So She plays asa Japanese player. m 2018, she became a pro and began to win more and more. finally mm the 2018 U.S. Open, she became the frst Japamese Womari to reach the *fnal. There, she played against Serena Wiliams. Osaka beat Wiliams 盆0 to win the *trophy, After the win, her rank became 7 m the world. Osaka is known ( RE ) her strong play. Im interviews, she often speaks Japanese and English. She is popular because she is a professional tenmis player, but she seems Hike a normal young woman. After the U.S. Open, Osaka said、T Just want to say thank you for watching the game. It Was always my dream to play against Serena in the US Open fmals,so Im really glad I was able to ② do that. Thank you.” She is now a hero in Japan. ard Francois, 1S from *Haiti. *pbeat 打ち負かす *U.S. Open Tenmis Toummament 全米オープン *Grand Slam singles tourmament グランドスラム個人戦 (世界の 4 大テニストーナメント) *Haiii ハイチ (西インド諸島に位置する国) *Japan Tennis Association 目本テニス協会 *fimal 決勝 *trophy トロフィー Q) ( A )~-( E ) に入る最も適切なものを 次のアーエ 時 Q oiが つ選び、 記号で答えなさい。 詳 人 m 人6 フ shess ES 8) アァ on 用 at ウ NR (⑨品22 1o イ can 2 ie AU (NNア Simce イ for ウ NHN SS ini0 アァ not 了仙1 MS EE計2ften 工 since

解決済み 回答数: 1
英語 中学生

(1),(5)がよく分からなかったので、教えてほしいです🙇‍♀️ よろしくお願いします。

*newSDaDeF to me ana ng my mother showed the ・letters Dag of the まで er, Yuka.Tthink is about 昌DU YO Yery BuTPTT adthe。 ! She “wrote about two kina | r of the letter was my new friend Ayumi. た at.One of the grls is me 本 計 1etter belped her cpt, Teid, Tbelpon 5 で 9 Last Sunday was my birthday. 1 ・planned to have a pirthdaY party- Before the.party re. We sometimes Mariko and T went to the library. We read sorne do that because we are the members of the volunteer club at ouT ]ibrary at nine and read books to children for one に trees there- Thnen a "httle grl After that, we went to the park. There were many n the tree. The ・shouted, "Help!" The girl was standing by a tree, and a girl said, "That's my cat. He cant *get down.” Mariko said, your cat." She went to the Hibrary and *borrowed a "1adder- We *set it against the tree。 and T *climbed it and helped the cat. The に said, “Thank you Yerツ much She said, “You are very kind. My name is Ayumi. This is my Cc8at Sbiro. What are YOur names? Do you live near this park?" We told her our nanne5 an { talked with her. my house. Some friends came to the party、 | Tn the afternoon IT had a birthday party at Mariko came, too. We listened to music and enjoyed ome cakes. 。 (were ノ mother / aid, “Some friends jittle cat WaS 1 *Don't *WOTTY- Wellhelb 【 d *addreSSeS。 and we 3 ther was with | they プ myンノ by ノ made) . When we were eating cakes。 ny mother 8 yumi's mn0 have *come to meet you, Yuka.” They Were Ayumi and Shiro. 『い *You helped Shiro this morning. Thank you Very them, too. She said to Mariko and me, much." And Ayumi and Shiro joined the party. This WaS 3 *happening of last Sunday. When T read the letter yesterday, 1 remembered Ayumi's words. At my birthday party “*Happy birthday, Yuka. But I dont have a present for YOu today. TU days.” 1read the ]etter again. The 1etter *said at the *end, friends Yuka and Mariko- And bappy birthday, Yuka." sa nice present from Ayumi. she said to me, send you a present *in a fow "Thank you very much, my neW When Iread that, 。T *smiled. That wa 投半棚 *newspaper : 新聞 *letter : 投書 *be surprised : 驚く *writer : 筆者 小さい *shout : 叫ぶ *]etters page : 投 *wrote : write の過去形 plan: 計画する *pefore : の前に “httle 隆りる *worry : 心配する *pborrow : 借りる *adder : はしこ *come : come の過 *address : 住所 *in: 一のうちに *say: * get down *climb : のぼる : …に一を立てかける *set 一 against … *happy birthday : 誕生日おめでとう 分調形 いてある *end : 最後 *happening : 出来事 *smile : ほはほえむ

解決済み 回答数: 1