## Important Concepts and Formulas - Sequence and Series

macoi
2015-06-18 12:35:06
mathematically speaking, the next term cannot be determined by giving only the first finite number of terms of a general sequence. explain this fact by giving examples
sani
2015-05-11 10:59:13
I hate sequence and series but after watching these formulas arrange in such an efficient manner i now i feel relaxed now i am not soooooooo much confuse so thanks.
pardeep
2015-03-29 09:09:19
354 180 64 21 10.2 ?
Dev
2015-04-06 20:23:11
354/2 + 3 =  180
180/3 + 4 = 64
64/4 + 5 = 21
21/5 + 6 = 10.2
10.2/6 + 7 = 8.7
Ankita
2015-03-25 05:49:29
What is the formula to find relation between ap hp
Apurv
2015-08-22 06:46:57
no formula

If a, b, c are in AP, 2b = a + c

Suppose a,b,c are in H.P. As reciprocals of A.P. are the terms in H.P,

$\dfrac{2}{b}=\dfrac{1}{a}+\dfrac{1}{c}\\ \Rightarrow \dfrac{2}{b}=\dfrac{a+c}{ac}\\ \Rightarrow \dfrac{b}{2}=\dfrac{ac}{a+c}\\ \Rightarrow b=\dfrac{2ac}{a+c}$
vishal
2014-12-17 16:55:18
Divide 20 into 4 parts which are in A.P. and such that the product of first and fourth is to product of the second and third in ratio 2:3

gandhi
2015-10-30 11:10:22
a-3d , a-d, a+d, a+3d

(a^2- 9d^2)/ (a^2-d^2) = 2/3
a/d=5

total = 20= 4a
a= 5

2, 4,6,8
patlolla
2015-04-02 05:11:01
2+4+6+8=20
1st x 4th=2nd x 3rd
16=24
2:3
Jay
2014-12-20 20:45:30
2,4,6,8  or 8,6,4,2

12345Next Go

Add a new comment...  (Use Discussion Board for posting new aptitude questions.)

Name:
Email: (optional)

X
View & Edit Profile Sign out
X