1.
$a_{n}=\frac{(-1)^{n+1}}{2^{n}}$, then $a_{6}=?$
2.
Geometric mean of Two positive numbers a and b
3.
Arithmetic mean between $2+\sqrt{2}$ and $2-\sqrt{2}$ is:
4.
How many terms of sequence $18,15,12,....$ are needed to give a sum of 63?
5.
An arithmetic progression has a first term 12 and a fifth term 18, then the sum of first 25 term is.
6.
The nth term of sequence $\frac{1}{3},\frac{2}{5},\frac{3}{7},....$ is:
7.
If $a,A,b$ are in A.P then $2A=?$
8.
G.Ms between $1$ and $\frac{1}{3}$ is:
9.
An infinite geometric series is convergent if _____
10.
Sum of the series $1+3+5+7+9+11+...+n$ terms is:
11.
The A.M between two numbers a and b is ________
12.
For an infinite geometric series for which $|r|
13.
Find the $26^{th}$ terms from the end of A.P : $2,7,12,17,...,222.$
14.
An arithmetic series $S_{n}$ equals to ____
15.
For what value of $n$, $\frac{a^n+b^n}{a^{n-1}+b^{n-1}}$ is the A.M between a and b?
16.
The formula $S_{n}=\frac{a(r^{n}-1)}{r-1}$ is used for sum of a terms of G.P. if ____
17.
Predict the general term for the sequence $\frac{4}{3},\frac{4}{9},\frac{4}{27},\frac{4}{81},...$
18.
If $a,b$ are negative and G.M is also negative
19.
$\sum_{k=1}^{n} k^{2}=?$ or $(1^2+2^2+3^2+...+n^2)=?$
20.
In the sequence $1,2,2,3,3,3,4,4,4,4,...$ where n-consecutive terms have the value n, the $22^{nd}$ term is:
21.
If $\frac{1}{a},\frac{1}{b}$ and $\frac{1}{c}$ are in A.P then common difference is equal to_________.
22.
$\sum_{k=1}^{n} k=?$ or (sum of first n terms)
23.
$0.1+0.01+0.001+0.0001+....$ the sum is:
24.
If $\frac{4}{7}$ be the third term of H.P, then third term of A.P is:
25.
Sum of $n$ terms of an A.P is ____
26.
Sequence is denoted by______
27.
The $(n+1)th$ term of an A.P is _______
28.
The reciprocal of the term of H.P is.....
29.
If $\frac{1}{a},\frac{1}{b}$ and $\frac{1}{c}$ are in G.P then common ratio is equal to_________
30.
Sum of the series $\frac{5}{(13)^{1}}+\frac{55}{(13)^{2}}+\frac{555}{(13)^{3}}+\frac{5555}{(13)^{4}}+...$ up to $\infty$ is:
31.
If $a_{n-2}=3n-11$ then nth term is
32.
In geometric sequence nth term equal to
33.
If $a,b,c$ are in G.P and $a>0,b>0,c>0,$ then the reciprocals of $a,b,c$ form ______
34.
If $a,b,c$ are in A.P, then $3^{a},3^{b},3^{c}$ are in:
35.
Arithmetic Mean between two numbers $\frac{1}{a}$ and $\frac{1}{b}$ is:
36.
$\frac{1}{k}, \frac{1}{2k+1}, \frac{1}{4k-1}$ are in H.P then $k=?$
37.
The general term of the given series $\frac{1}{1.3}+\frac{1}{2.5}+\frac{1}{3.7}+...$ is
38.
If $y=\frac{2}{3}x+\frac{4}{9}x^2+\frac{8}{27}x^3+....$ then interval of convergence is____
39.
The sigma notation for the sum $-2+4-6+8$ is:
41.
$\sum_{k=1}^{3} k^2$ is equal to:
42.
The next term of G.P. $1,2,4,8,16,...$ is:
43.
If $a_{n}-a_{n-1}=n+2$, $a_{1}=2$ then $a_{3}=?$
44.
$\sum_{j=1}^{10} \sum_{i=1}^{15} k =?$
45.
In $\frac{1}{4.7}+\frac{1}{7.10}+\frac{1}{10.13}+$...., then $n^{th}$ term is:
46.
What is sum of n term with nth term $a_{n} = 4n+1$
47.
If the nth term of an A.P is $\frac{1}{2}(3-n)$ then first three terms are _________
48.
A.M between $\frac{a}{2}$ and $\frac{2}{a}$ is
49.
$a_{5}$ in G.P $3,6,12,...$ will be _____
50.
If A,G,H have their usual meanings and 'a' and 'b' are positive distinct real numbers and $G>0$, then:
51.
$S_{n}=1+2+3+...+n$ can also be shown as_______
52.
Let $a,b$ be two positive numbers, where $a>b$ and $4\times\,G.M=5\times\,H.M$ for the numbers, the a is:
53.
The arithmetic mean in the sequence $-7$,_,_,$5$ are
54.
If $\frac{1}{a},\frac{1}{b}$ and $\frac{1}{c}$ are in A.P then b is equal to_________.
55.
Which term of $64,60,56,52,...$ is zero?
57.
The $10^{th}$ term of $\frac{1}{2},\frac{1}{5},\frac{1}{8},...,$ is:
58.
If $a_{1}$ and $r$ are the first term and common ratio respectively then the $(n+1)^{th}$ term of G.P is________
59.
$\sum_{k=1}^{n} 5$ is equal to:
60.
If $\frac{1}{5}, \frac{1}{8}$ are two H.M between $\frac{1}{2}$ and $b$ then be equals to
61.
The sum $\sum_{r=2}^{\infty} \frac{1}{r^2-1}$ represents:
62.
An infinite sequence has no __________
63.
A sequence $a_{n}$ is an arithmetic sequence if $\forall \, n\in\,\mathbb{N}$ and $n>1$:
64.
Sum of $n$ arithmetic means between a and b is ________
65.
What is the sum of infinite G.P; $2,\sqrt{2},1,...?$
66.
$\sum_{k=1}^{n} k^{3}=?$ or $(1^3+2^3+3^3+...+n^3)=?$
67.
If $x,y,z$ are in H.P. Sequence then value of z is ______
68.
Find first term of the geometric series, when $S_{n}=30,n=4,r=-2$
69.
The nth term of an A.P with usual notions is ______
70.
The series $1+\frac{x}{2}+\frac{x^2}{4}+...$ is convergent if________
