2,416 reputation
31126
bio website
location
age 38
visits member for 3 years, 8 months
seen 8 hours ago

7h
awarded  Notable Question
11h
comment divide 6 people in group of 2 in same size
You are welcome
11h
comment divide 6 people in group of 2 in same size
To find the number of ways in which $m + n$ things can be divided into two groups containing $m$ and $n$ things respectively. This is clearly equivalent to finding the number of combi nations of $m + n$ things $m$ at a time, for every time we select one group of $m$ things we leave a group of n things behind. Thus the required number = $\frac{(m+n)!}{m!.n!}$. If $n=m$, the groups are equal, and in this case the number of different ways of subdivision is $\frac{2m!}{m!m!2!}$ for in any one way it is possible to interchange the two groups without obtaining a new distribution.
17h
revised Solving a system of three simultaneous equations
latex added
19h
comment Algebraic manipulation and logarithms
$3*\left(\frac{n}{2}\right)^{\log_2 3}=3*\left(\frac{n^{\log_2 3}}{2^{\log_2 3}}\right)=3*\left(\frac{n^{\log_2 3}}{3}\right)=n^{\log_2 3}$
19h
reviewed Approve $x$-values for tangent to the curve then to a perpendicular lines
20h
answered $x$-values for tangent to the curve then to a perpendicular lines
1d
comment The top 1% own 50% of the world's wealth - how do we turn this into a function?
@hawkeye, it will work only for naturals or integers, not reals, so $x \in \mathbb N$
1d
comment The top 1% own 50% of the world's wealth - how do we turn this into a function?
$y=134.5^{\frac{1}{x}}$, first term$=134.5$, sum of next $99$ terms $=134.46$
1d
comment Word problem - help
@KAPO, happy to help :)
1d
answered Word problem - help
2d
comment What is the best trigonometry book available free?
I have laptop so can't say. It is blur but serves the purpose. Have a look at it yourself, it is approx 5MB.
2d
comment What is the best trigonometry book available free?
Plane Trigonometry by Loney on : archive.org
Jan
23
comment Finding the height of a bouncing ball. (Using the geometric series in an applied setting)
@OscarFlores, which height?
Jan
23
answered Find out students
Jan
23
comment How to find the formula of S3n?
I don't know if this is valid:$123*3=369+74=443, 123*4=492+64=556, 123*5=615+54=669$, so it is $1,2,3,4,4,3,5,5,6,6,6,9$
Jan
23
comment Finding the height of a bouncing ball. (Using the geometric series in an applied setting)
@OscarFlores, there are only 9 terms in the bracket
Jan
23
comment Finding the height of a bouncing ball. (Using the geometric series in an applied setting)
@OscarFlores, the bracket contains height of 2nd+3rd+4th+...+10th bounce/drop
Jan
23
answered How much laundry is done?
Jan
23
comment How much laundry is done?
This way you will do all the problems without learning anything. Try to rephrase the problem in your words, assume different names/things/scenario, look at the similar problem with solution and argue why or why not the solution is applicable here.