Question 1

What is nth term in an AP

Accepted Answer

a_{n =}a + (n-1) d

Answer

a_{n =}a - (n-1) d

Answer

a_{n =}a + (n) d

Answer

a_{n =}a + (n +1) d

Question 2

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

Accepted Answer

S₅ = $\frac{5}{2}$ [ a + 4d]

Answer

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

Answer

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

Answer

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

Question 3

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

Accepted Answer

3d

Answer

a + d

Answer

2d

Answer

d

Question 4

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

Accepted Answer

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

Answer

b - a

Answer

a + b

Answer

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

Question 5

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

Accepted Answer

8, 12

Answer

8, 10

Answer

6, 10

Answer

10, 12

Question 6

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

Accepted Answer

G. P.

Answer

H. P.

Answer

Special Series

Answer

A. P.

Question 7

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

Accepted Answer

512

Answer

256

Answer

128

Answer

1024

Question 8

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 9

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

Accepted Answer

- 4, -1, 2

Answer

2, - 1, 4

Answer

4, 1, 2

Answer

- 4, 1, - 2

Question 10

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

Accepted Answer

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

Answer

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

Answer

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

Answer

a + b

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