Question # 1

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2

-3/2

1

0

If a₁= a₂= 2, a_n= a_n-1- 1 (n > 2), then a₅is

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1

0

-1

-2

A,G,H are in

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A.P

G.P

H.P

None of these

An infinite sequence has no

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nth term

Last term

Sum

None of these

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12

13

14

15

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

Given two numbers a and b. Let A denote the single A.M. between these and S denote the sum of n A.M.'s between them. Then S/A depends upon

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n, a, b

n, a

n, b

n

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

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G.P

H.P

G.M

None of these

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

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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If the pth, qth, and rth terms of an A.P. are in G.P:., then the common ratio of the G.P. 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

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 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 third term of a G.P. is the square of first term. If the second term is 8, then the 6th term is

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120

124

128

132

The 6th term of the sequence 7,9,12,16......is

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27

32

20

19

The common ration of a geometric sequence cannot be

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0

1

2

3

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

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A.P.

G.P.

H.P.

None of these

H.M. between 3 and 7 is

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0

1

2

3

If a, b, c, d, e, f are in A.P.,then e-c is equal to

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2(c - a)

2(f - d)

2(d - c)

d - c

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

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The sum of all 2 digit number is

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4750

3776

4895

4905

The third term of a G.P. is 4, The product of first five terms is

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43

45

46

None of these

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

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2²- n - 1

1 - 2^-n

n + 2^-n-1

2ⁿ- 1

Which one represents a sequence

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an

Sn

a(n)

{an}

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

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

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