Question # 1

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

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54

12

4

9

The A.M. of two numbers is 34 and G.M. is 16, the numbers are

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2 and 64

64 and 3

64 and 4

None of these

For three consecutive terms in A.P middle term is called

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A.M

nth term

Central term

None of these

Find the sum of the infinite geometric series 2 + 1 + 0.5 + ....

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3.5

3

4

None of these

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

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The common ration of a geometric sequence cannot be

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0

1

2

3

The next term of the sequence 1, 2, 4, 7, 11, ..... is.

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15

16

17

18

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1/2

2

1/4

4

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

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

Which one represents a sequence

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an

Sn

a(n)

{an}

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

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Harmonic sequence

Arithmetic sequence

Geometric 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

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

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How many term are there in the A.P, in which a₁ = 11 , a_n =68, d=3

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30

27

20

21

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

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125

107

108

113

If x,y are two -ve distinct numbers then

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A>G>H

A<G<H

A=G=H

None of these

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

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A.P

Real Sequence

G.P

None of these

The harmonic mean between a and b is

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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

If b₁, b₂, b₃, ... are in G.P. with first term unity and common ratio r, then the minimum value of b₁- b₃+ b₅is equal to

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3/4

1/4

1

None of these

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

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1500

72

2160

2520

Let S_ndenote the sum of the first n terms of an A.P. If S_2n= 3 S_n: S_nis equal to

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4

6

8

10

An indicated sum of terms of a sequence is represented by

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Sn

an

S(n)

{Sn}

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

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sequence

progression

Series

Mean

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

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 element range of sequence are called

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Series

progression

Members

Terms

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

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

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