ลำดับเลขคณิตและลำดับเรขาคณิต

ลำดับเลขคณิตและลำดับเรขาคณิต

11th Grade

10 Qs

quiz-placeholder

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ลำดับเลขคณิตและลำดับเรขาคณิต

ลำดับเลขคณิตและลำดับเรขาคณิต

Assessment

Quiz

Mathematics

11th Grade

Practice Problem

Medium

Created by

ลักขณา คุณะนาม

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

ลำดับ 1, 2, 4, 8, 16, ... มีรูปทั่วไปเท่ากับข้อใด

an=3n2a_n=3n-2

an=4n1a_n=4^{n-1}

an=2n1a_n=2^{n-1}

an=2na_n=2^n

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

ลำดับ 1, 4, 9, 16, 25, ... ในรูปพจน์ทั่วไปเท่ากับข้อใด

an=2n1a_n=2n-1

an=2n1a_n=2^n-1

an=(n+1)2a_n=\left(n+1\right)^2

an=n2a_n=n^2

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

ลำดับ 4, 8, 12, 16, 20, ... มีรูปทั่วไปเท่ากับข้อใด

an=2n+1a_n=2n+1

an=4na_n=4n

an=4+na_n=4+n

an=n4a_n=\frac{n}{4}

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

ข้อใดเป็นพจน์ทั่วไปของลำดับ 9, 99, 999, 9999, ...

an=10n1a_n=10^n-1

an=9na_n=9^n

an=110na_n=1-10^n

an=10n1a_n=10n-1

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

  12, 34, 56, 78ข้อใดเป็นพจน์ทั่วไปของลำดับ\ \frac{1}{2},\ \frac{3}{4},\ \frac{5}{6},\ \frac{7}{8}  

 an=2n+12na_n=\frac{2n+1}{2n}  

 an=2n12na_n=\frac{2n-1}{2n}  

 an=2n+1n+1a_n=\frac{2n+1}{n+1}  

 an=2n1n+1a_n=\frac{2n-1}{n+1}  

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

สองพจน์ถัดไปของลำดับ 1, 3, 7, 13, 21, ...ตรงกับข้อใด

30, 43

31, 43

30, 42

31, 42

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

ลำดับเลขคณิตที่มี 3, 8, 13, 18, 23, ... มีพจน์ที่ 5 เท่ากับเท่าใด

58

63

68

73

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