Question # 1

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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

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

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1

0

-1

-2

An indicated sum of terms of a sequence is represented by

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Sn

an

S(n)

{Sn}

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

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3.5

3

4

None of these

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

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A.P.

G.P.

H.P.

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

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2

-3/2

1

0

The 26th term of the A.P -2,-4,10,.............is

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136

-136

148

-148

A function whose domain is a subset of natural numbers is called ______

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Identity function

Sequence

Onto function

Series

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

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104th

106th

105th

64th

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1/2

2

1/4

4

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

A Geometric Series is divergent only if

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|r|>1

|r|≥1

|r|=1

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

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

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

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G.P

H.P

G.M

None of these

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

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

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Series

Function

progressions

Elements

The 6th term of an arithmetic sequence whose first term is 3 and common difference in zero is

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18

6

3

0

The harmonic mean between a and b is

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

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400

397

404

408

Sum of first n terms of an arithmetic series is

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If x, y, z are the pth, qth, rth terms of an A.P. and also of G.P., then x^y-z. y^z-x. z^x-yeqals

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xyz

0

1

None of these

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

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1st term

General term

Last term

None of these

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

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8

4

-4

8

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

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