Question # 1

The sum of all 2 digit number is

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4750

3776

4895

4905

A sequence whose reciprocal is an A.P is called

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Oscillator

H.P

G.P

None of these

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

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35

36

48

49

If a₁, r are first term and the common ratio respectively then the sum of an infinite geometric series is

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Every term of a G.P. is positive and also every term is the sum of two preceding terms. Then the common ratio of the G.P. is

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The 31 term of the A.P 5,2,-1.....is

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-82

82

85

-85

A number A is said to be the A.M between the two numbers a and b if a, A, b are in

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A.M

A.P

G.P

G.M

Sum of first n terms of an arithmetic series is

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The general term of a sequence is denoted by

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a₁

a_n

n

s_n

The harmonic mean between a and b is

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12

13

14

15

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15/23

7/15

7/8

15/7

An infinite arithmetic series is always

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Convergent

Oscillatory

Divergent

None of these

The consecutive terms of a progressions are 30, 24, 20. The next term of the progression is

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The common ration of a geometric sequence cannot be

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0

1

2

3

If a^x= b^y= c^zand a, b, c are in G.P. then x, y, z are in

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A.P.

G.P.

H.P.

None of these

The difference of two consecutive terms of an A.P is called the

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Common difference

Common ratio

Geometric series

Geometric mean

If 5,7 and 9 are A.Ms between a and b, then a and b is equal to

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2 and 12

1 and 10

3 and 11

-7 and 2

Geometric mean between a and b is

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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

1,1/3,1/5,1/7,1/9..... is a

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geometric sequence

finite sequence

infinite sequence

arithmetic series

p, q, r and s are integers. If the A.M. of the roots of x2- px + q2= 0 and G.M. of the roots of x2- rx + s2= 0 are equal, then

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q is an odd integer

r is an even integer

p is an even integer

s is an odd integer

The formula an = arn-1represents

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nth term of G.P

Sum of the first n terms

G.M between a and b

None of these

The series obtained by adding the terms of an arithmetic sequence is called the

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Infinite series

Harmonic series

Geometric series

Arithmetic series

The sum of an infinite geometric series exist if

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| r | < 1

| r | > 1

r = 1

r = -1

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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

The sum of n terms of a series is denoted by

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d

n

S_n

a_n

If G is a G.M between a and b then a,G,b are in

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A.P

H.P

G.P

None of these

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

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Identity function

Sequence

Onto function

Series

The third term of a G.P. is 4, The product of first five terms is

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43

45

46

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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