Question # 1

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Find the next two terms of 7, 9, 12, 16,...

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18, 20

19, 22

20, 25

21, 27

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

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125

107

108

113

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A.P.

G.P.

H.P.

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

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

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-1, 4, -9, 16

1, -4, 9, 16

1, 4, 9, 16

None of these

If a₁= 3, r = 2, then the nth term of the G.P. is

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2.3^n-1

3.2ⁿ

3.2ⁿ⁺¹

3.2^n-1

The fifth term of an A.P. Whose first term is 5 and common difference is 3,is

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20

17

25

30

The element range of sequence are called

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Series

progression

Members

Terms

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

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G.P

H.P

G.M

None of these

For an A.P common difference d

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Can be zero

May or may not zero

Cannot be zero

None of these

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

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A.P.

G. P.

H. P.

None of these

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

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26

7

21

Cannot be determined

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 sum of first twenty odd integers in A.P is

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400

397

404

408

A Series which does not coverage to a Unique sum is called

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Harmonic Series

Oscillatroy Series

Arithmetic Series

None of these

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15/23

7/15

7/8

15/7

If three unequal numbers p, q, r are in H.P. and their squares are in A.P., then the ration p : q : r is

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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

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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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The third term of the sequence a_n= (-1)^n-1(n-7) is ______

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8

4

-4

8

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

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geometric sequence

finite sequence

infinite sequence

arithmetic series

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

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

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2 mn

1/2 mn

mn

mn²

If #n = (n-5)2 + 5, then find #3 x #4.

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54

12

4

9

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

The general term of the A.P. is

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a₁+ (n - 1) d

n + (a₁- 1) d

d + (n - 1) a₁

None of these

The harmonic mean between a and b is

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The sum of all 2 digit number is

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4750

3776

4895

4905

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

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