# MTest11-1/Sequences-Series

## Quiz by Vijay Kumar

Class XI
Mathematics
Central Board of Secondary Education

### Our brand new solo games combine with your quiz, on the same screen

Correct quiz answers unlock more play!

10 questions
• Q1

What is nth term in an AP

an = a - (n-1) d

an = a + (n) d

an = a + (n +1) d

an = a + (n-1) d

15s
• Q2

What is  sum of five terms of an AP. if  it has first term 'a' and common difference  'd'

Sn = $\frac\left\{n\right\}\left\{2\right\}$[ a + (5-1)d]

Sn =  $\frac\left\{n\right\}\left\{2\right\}$[ a + (n +1)d]

Sn = $\frac\left\{n\right\}\left\{2\right\}$[ a + (n-1)d]

S 5 =  $\frac\left\{5\right\}\left\{2\right\}$[ a + 4d]

15s
• Q3

What is the common difference in  an AP:   a , a +3d , a + 6d , a + 9d , ......

a + d

2d

3d

d

15s
• Q4

What is arithmetic mean between two terms 'a' and 'b' ?

b - a

$\frac\left\{a\ +\ b\right\}\left\{2\right\}$

a + b

$\frac\left\{a\ -\ b\right\}\left\{2\right\}$

15s
• Q5

Insert two numbers between 4 & 16, so that resulting numbers are in AP.

8, 10

6, 10

8, 12

10, 12

45s
• Q6

If a , b, c are in A.P., then 3 a , 3 b , 3 c  are in :

G. P.

H. P.

Special Series

A. P.

45s
• Q7

5th term of a GP is 2 , then the products of first 9 terms is :

256

128

512

1024

60s
• Q8

If r < 1  in a G P, then sum to n terms is   Sn =

$\frac\left\{a\ \left\left(\ r^\left\{\ n\right\}\ -\ 1\right\right)\right\}\left\{r\ -\ 1\right\}$

$\frac\left\{a\ \left\left(\ 1-\ r\ ^n\right\right)\right\}\left\{1\ -\ r\right\}$

$\frac\left\{n\right\}\left\{2\right\}\left\left[a\ +\ l\right\right]$

$\frac\left\{a\ \left\left(\ r^\left\{\ n\ \right\}-1\right\right)\right\}\left\{1\ -\ r\right\}$

20s
• Q9

Sum of three numbers in an A P = -3 and  their Product = 8, then numbers are

2, - 1, 4

4, 1, 2

- 4, -1, 2

- 4, 1, - 2

120s
• Q10

The A. M.  between two number 'a'  and  'b'  is :

$\frac\left\{a\ +\ b\right\}\left\{2\right\}$

$\frac\left\{a\ -\ b\right\}\left\{2\right\}$

$\sqrt\left\{a\ b\right\}$

a + b

15s

Teachers give this quiz to your class