Question # 1

A sequence having no last term is called

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arithmetic sequence

Geometric sequence

Finite sequence

Infinite sequence

If A is such that a,A,B are in A.P then A is called

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A.M

Common ratio

Common difference

None of these

The 6th term of an arithmetic sequence whose first term is 3 and common difference in zero is

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18

6

3

0

A sequence is a functions whose domain is a subset of the set of

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Natural numbers

Real numbers

Whole numbers

Rational numbers

If x,y are two positive distinct numbers then

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A>G>H

A<G<H

A=G=H

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=

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a₁rⁿ

a₁r^n-1

a₁rⁿ⁺¹

a₁r

The sixth term of the sequence 1,3,12,60....is

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1500

72

2160

2520

Let S_ndenote the sum of the first n terms of an A.P. If S_2n= 3 S_n: S_nis equal to

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4

6

8

10

Geometric mean between a and b is

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A sequence of number whose reciprocals form an arithmetic sequence is called

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Geometric sequence

Arithmetic series

Harmonic sequence

Harmonic series

A function whose domain is a subset of natural numbers is called ______

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Identity function

Sequence

Onto function

Series

an - an-1 will be common difference in an A.P if

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n = 1∀n∈ N

n>1∧n∈N

n∈Z

None of the above

-2, 1, 4, 7,.... is ______

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Harmonic sequence

Arithmetic sequence

Geometric sequence

Arithmetic series

If all members of a sequence are real numbers then it is called a

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Series

Function

Real sequence

Range

The next term of the sequence 1, 2, 4, 7, 11, ..... is.

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15

16

17

18

The sum of infinite numbers of terms of an arithmetic series is

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Finite

Infinite

May or may not finite

None of these

If a,b,c are in arithmetic progression, then 1/a,1/b.1/c are in

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A.M

G.M

H.M

G.P

The sum of n terms of a series is denoted by

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d

n

S_n

a_n

If 6th term of a series in A.P, is -2 and 8th term is -8, the first term of the serie is

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13

-13

18

-10

If a_n= 2n -3, write the first four terms

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-3, -1, 1, 3

1, 3, 5, 7

-1, 1, 3, 5

None of these

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

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Infinite series

Arithmetic series

Geometric series

Harmonic series

If the pth, qth, and rth terms of an A.P. are in G.P:., then the common ratio of the G.P. is

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If a₁= a₂= 2, a_n= a_n-1- 1 (n > 2), then a₅is

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1

0

-1

-2

The fifth term of the sequence a_n= 2n + 3 is ______

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13

-13

8

3

Arithmetic mean between a and b is

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G is geometric mean between a and b if a, G, b is

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A.P.

G.P.

H.P.

None of these

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

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125

107

108

113

The number of divisors of 1029, 1547 and 122 are in

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A.P.

G.P.

H.P.

None of these

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

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