Tập
gồm
phần tử
. Hỏi
có bao nhiêu tập con?
A.
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827996216_images/obj20192819676011277827996216_img1.png)
B.
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827138320_images/obj20192819676011277827138320_img1.png)
C.
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827661747_images/obj20192819676011277827661747_img1.png)
D.
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827268229_images/obj20192819676011277827268229_img1.png)
Đáp án và lời giải
Đáp án:C
Lời giải:Phân tích:
Số tập con gồm
phần tử của tập
là
(với
,
).
Số tất cả các tập con của tập
là ![img7](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img7.png)
.
Vậy đáp án đúng là C.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img3.png)
![img4](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img4.png)
![img5](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img5.png)
![img6](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img6.png)
![img7](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img7.png)
![img8](https://cungthi.online/upload/questionbank3/eduquestion/20192819676011277827/obj20192819676011277827745133_images/obj20192819676011277827745133_img8.png)