Question # 1

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

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2

-3/2

1

0

The sum of n terms of a series is denoted by

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d

n

S_n

a_n

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

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A.P.

G.P.

H.P.

None of these

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

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400

397

404

408

The common ration of a geometric sequence cannot be

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0

1

2

3

A sequence having no last term is called

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arithmetic sequence

Geometric sequence

Finite sequence

Infinite sequence

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

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8

4

-4

8

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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1, 1/2, 0

1, 2, 1

1, 2, 3

1, 2, 0

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

The sum of first 60 natural numbers is

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1830

3660

1640

1770

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The sides of a right angled triangle are in A.P The ratio of sides is

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1:2:3

3:4:5

2:3:4

5:8:3

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

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

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

Sequence also called..............

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Series

Function

progressions

Elements

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1/2

2

1/4

4

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

No term of a geometric sequence can be

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0

1

2

3

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

A,G,H are in

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A.P

G.P

H.P

None of these

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

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P-6q

P+6q

P-4q

P-nq

Let a₁, a₂, a₃, a₄and a₅be such that a₁, a₂, and a₃are in A.P., a₂, a₃and a₄are in G.P and a₃, a₄and a₅are in H.P. Then, a₁, a₃and a₅are in

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G.P.

A.P.

H.P.

None of these

The nth term of a G.P. is

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a₁rⁿ

a₁rⁿ⁺¹

a₁r^n-1

a₁r^-n

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

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

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Which term of the A.P 5,8,11,24.............is 320

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104th

106th

105th

64th

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

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

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