Có 2 lô hàng, lô 1 có 10 sản phẩm tốt và 2 sản phẩm lỗi, lô 2 có 12 sản phẩm tốt và 3 sản phẩm lỗi. Trộn 2 lô lại với nhau rồi lấy ra một sản phẩm, sản phẩm đó là sản phẩm lỗi. Tính sắc xuất để sản phẩm đó là của lô 1.

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V/ Choose the best answers: 1. Did you (go / going / goes / went) to Nam’s birthday? –Yes, I (don’t / do / did / didn’t ). 2. How ( many / much / often /old ) water does Tom drink everyday? He (drank / drink / drinks / drunk) four bottles of water. 3. What are you doing? I’m (reading / watering / surfing / listening) the Internet. 4. What (is / was / will / were ) the weather be like tomorrow? It’ll (be/ to be / is / am) sunny and hot. 5. (What / Why / Where /Who ) do you learning English? Beacause I want to (watch / watches / watching / watched) English cartoons on TV. 6. We went to Phu Quoc Island (on / in / by / from) ship. 7. What are you reading? I’m reading (an / a / two /three) amazing story. 8. Who is the main (character/ characters / chiracter / chasacter)? 9. What’s the matter with (her/ herself / him / himself )? (They / We / I / He) has a sore throat 10. What does she often (does / did /doing /do) in her free time? She goes (jogging / football / skipping / badminton). 11.(What/ Where) are you doing, Linda? I’m (surfing/ doing) the Internet. 12.How (often/ old) does Nam study with his partner? He often (studys/ studies) with his partner everyday. 13.Where (do/ did) you go last summer holiday? I went (in/ to) Phu Quoc Island. 14. How did you (get/ got) there? I went (from/ by) ship. 15. Did Mary go to (Nam/ Nam’s) birthday party? Yes, she ( did/ didn’t). 16.What did she (have/ do) at Nam’s birthday party? She (have / had) nice food and drink. 17.Where (was/ were) you yesterday? I was (at/ in) the seaside. 18.They took (part/ parts) in the festival on Sunday. 19.We (enjoyed/ enjoys) the food and drink at the party yesterday. 20.I want to (invite/ invited) Tony and Phong to my birthday party.