Question # 1

Write the first four terms of the sequence if a_n= (-1)ⁿn²

Choose an answer

-1, 4, -9, 16

1, -4, 9, 16

1, 4, 9, 16

None of these

5th term of a G.P. is 2, then the product of first 9 terms is

Choose an answer

256

128

512

None of these

The 7th term of the A.P 7,11,15,is

Choose an answer

24

31

26

23

Find the sum of the infinite geometric series 2 + 1 + 0.5 + ....

Choose an answer

3.5

3

4

None of these

Choose an answer

15/23

7/15

7/8

15/7

An indicated sum of terms of a sequence is represented by

Choose an answer

Sn

an

S(n)

{Sn}

Which one represents a sequence

Choose an answer

an

Sn

a(n)

{an}

How many term are there in the A.P, in which a₁ = 11 , a_n =68, d=3

Choose an answer

30

27

20

21

A series consisting of an unlimited number of terms is termed as an

Choose an answer

Finite sequence

Infinite sequence

^{Infinite series}

geometric sequence

If p, q, r and in A.P., a is G.M. between p and q and b is G.M. between q and r, then a², q², b²are in

Choose an answer

A.P.

G.P.

H.P.

None of these

Choose an answer

A.P.

G.P.

H.P.

None of these

An A.P. consists of n(odd terms) and its middle term is m. then the sum of the A.P. is

Choose an answer

2 mn

1/2 mn

mn

mn²

In following question, a number series is given with one term missing. choose the correct alternative that will same pattern and fill in the blank spaces.1 , 4, 9, 16, 25, x

Choose an answer

35

36

48

49

Choose an answer

1, 1/2, 0

1, 2, 1

1, 2, 3

1, 2, 0

The general term of a sequence is denoted by

Choose an answer

a₁

a_n

n

s_n

A number A is called the arithmetic mean between a and b if a, A, b is ______

Choose an answer

Arithmetic sequence

Geometric sequence

Harmonic sequence

Arithmetic sequence

The sum of the squares of three distinct real numbers, which are in G.P., is S². if their sum isαS then

Choose an answer

The series obtained by adding the terms of a geometric sequence is called

Choose an answer

Infinite series

Arithmetic series

Geometric series

Harmonic series

Choose an answer

1

2

3/2

5/2

The three consecutive numbers a,√ab,b are in

Choose an answer

G.P

H.P

G.M

None of these

If a₁, r and a_nare the first term, common ratio and the nth term respectively of a G. P. then a_n=

Choose an answer

a₁rⁿ

a₁r^n-1

a₁rⁿ⁺¹

a₁r

Arithmetic mean between x - 3 and x + 5 is

Choose an answer

x + 1

x + 2

x + 3

x + 4

How many numbers are there between 103 and 750 which are divisible by 6

Choose an answer

125

107

108

113

Choose an answer

1/2

2

1/4

4

The5thand 13th terms of an A.P are 5 and-3 respectively The first term of the A.P is

Choose an answer

1

-15

9

2

What is the 26th term of the sequence, if its general term is a_{n = (-1)}ⁿ⁺¹

Choose an answer

2

26

27

1

The nth term of an A.P is (3n+5) Its 75th term is

Choose an answer

26

7

21

Cannot be determined

The sum of first twenty odd integers in A.P is

Choose an answer

400

397

404

408

The seventh term of an A.P whose first term is P and common difference is q. is

Choose an answer

P-6q

P+6q

P-4q

P-nq

For an arithmetic series to be convergent it is necessary that the series has

Choose an answer

Finite terms

d<0

Infinite terms

None of these

More Classes

Other Links

Mathematics ECAT Pre Engineering Chapter 8 Sequences and Series Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer