Question # 1

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 three consecutive numbers a,√ab,b are in

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G.P

H.P

G.M

None of these

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

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Finite sequence

Infinite sequence

^{Infinite series}

geometric sequence

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

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1

-15

9

2

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The sum of an indicated number of terms in a sequence is called

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sequence

progression

Series

Mean

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

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2

26

27

1

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1/2

2

1/4

4

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

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

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1500

72

2160

2520

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

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A.P.

G.P.

H.P.

None of these

If a₁and r are the first term and the common ratio respectively then (n + 1)th term of the G.P. is

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0

a₁r^n-1

a₁rⁿ⁺¹

a₁rⁿ

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

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Harmonic sequence

Arithmetic sequence

Geometric sequence

Arithmetic 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

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12

13

14

15

H.M. between 3 and 7 is

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

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geometric sequence

finite sequence

infinite sequence

arithmetic series

1/2,1/3,1/4,1/5.........is

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a geometric sec

an arithmetric series

finite sequence

an infinite sequece

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

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General term

Common ratio

Common difference

None of these

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

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400

397

404

408

Arithmetic mean between a and b is

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The 10th common term between the series 3+7+11+....... and 1 + 6 +11 + ....... is

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191

193

211

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

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2 mn

1/2 mn

mn

mn²

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2²- n - 1

1 - 2^-n

n + 2^-n-1

2ⁿ- 1

if a_{9 =19,a9=31 are the 6th and 9th term of an A.P. and d=4 is the common difference, then 18th term of the sequence is}

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65

67

71

75

If P, Q, R be the A.M., G.M., H.M. respectively between any two rational numbers a and b, then P - Q is

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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

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A.P.

G.P.

H.P.

None of these

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

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256

128

512

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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