Question # 1

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

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Series

Function

Real sequence

Range

In an A.P,a +(n-a)d is

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1st term

General term

Last term

None of these

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

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13

-13

8

3

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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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

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

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sequence

progression

Series

Mean

The sum of first 60 natural numbers is

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1830

3660

1640

1770

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1, 1/2, 0

1, 2, 1

1, 2, 3

1, 2, 0

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

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

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a geometric sec

an arithmetric series

finite sequence

an infinite sequece

Sum of n terms of a geometric series if | r | < 1 is

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Which one represents a sequence

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an

Sn

a(n)

{an}

Write the first four terms of the arithmetic sequence 5, 2, -1, ... is

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3

-4

7

1

If a, b, c are in A.P., then 3^a, 3^b, 3^care in

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A.P.

G.P.

H.P.

None of these

The common ration of a geometric sequence cannot be

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0

1

2

3

For an arithmetic series to be convergent it is necessary that the series has

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Finite terms

d<0

Infinite terms

None of these

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12

13

14

15

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

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 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

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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

The 7th term of the A.P 7,11,15,is

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24

31

26

23

No term of a harmonic sequence can be

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0

1

2

3

If the domain of sequence is finite set then the sequence is called

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geometric sequence

infinite sequence

finite sequence

arithmetic sequence

The element range of sequence are called

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Series

progression

Members

Terms

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 a geometric sequence is called

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Infinite series

Arithmetic series

Geometric series

Harmonic series

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

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