## Search found 56 matches

Wed Jan 11, 2012 11:49 pm
Forum: Algebra
Topic: \$Fn>n^2\$ sokol n>12 er jonno shotho induction based proof
Replies: 0
Views: 492

### \$Fn>n^2\$ sokol n>12 er jonno shotho induction based proof

*suppose F(n-1)>2n+1 sokol n>12 er jonno shotho mone kori 1st statement ta n er jonno sotho hole (n+1) er jonno sotho. it means, Fn>2(n+1)+1 =>F(n-1)+F(n-2)>(2n+1)+2 =>F(n-2)>2 eta sokol n>12 er jonno sotho tai 1st statement ta n er jonno sotho hole (n+1) er jonno sotho hoy. ekhon n=13,14 er jonno ...
Tue May 24, 2011 12:25 am
Forum: Higher Secondary Level
Topic: finding the equation from graph..
Replies: 4
Views: 1524

### Re: finding the equation from graph..

\$(y-3)/(x-2)=(y-8)/(x-5)=Slope(constant)\$
Sun May 22, 2011 12:46 am
Forum: Algebra
Topic: Smallest Perimeter of Quadrilateral With Equal Area
Replies: 10
Views: 2667

### Re: Smallest Perimeter of Quadrilateral With Equal Area U didn't hurt me i just ask u what u think about my proof, is it right is it good. Thanks for comment now i am trying ur proof.
Sat May 21, 2011 12:52 am
Forum: Algebra
Topic: Smallest Perimeter of Quadrilateral With Equal Area
Replies: 10
Views: 2667

### Re: Smallest Perimeter of Tetrahedren With Equal Area

i mean a geometric figure with four sides by tetrahedren if any error with that please don't think something different. for example triangle is a geometric figure with three sides.
@Tahmid, u can comment about my proof which can inspire me.
Fri May 20, 2011 5:39 pm
Forum: Algebra
Topic: Smallest Perimeter of Quadrilateral With Equal Area
Replies: 10
Views: 2667

### Re: Smallest Perimeter of Tetrahedren With Equal Area

\$ab=c^2\$. let \$a=c+x, b=c-y\$. then \$ab=c^2-cy+cx-xy=c^2\$ or, \$c(x-y)=xy\$ or, \$(x-y)=xy/c\$ it means \$(x-y)\$ is positive.
Now perimeter of tetrahedren, \$2(a+b)=4c+2(x-y)\$
since \$(x-y)>0\$ So \$2(a+b)>4c\$
(proved)
Fri May 20, 2011 12:44 am
Forum: Physics
Topic: বোস আইনস্টাইন statistics
Replies: 9
Views: 1996

### Re: বোঁস আইনস্টাইন statistics hi brother, u can read it in Wikipedia in english language here is link,
http://en.wikipedia.org/w/index.php?tit ... 1&redirs=0
Fri May 20, 2011 12:29 am
Forum: Number Theory
Topic: Math help!!!
Replies: 5
Views: 1513

### Re: Math help!!!

i find these three numbers.it's \$(41)^2+(43^2)+(45)^2=5555\$.
i find it in this method \$(2n-1)^2+(2n+1)^2+(2n+3)^2=12(n^2+n+1)-1\$. it means the \$4\$ digit number\$+1\$ is divisible by \$12\$ then i try \$1112,3334,5556...\$ etc.
Fri May 20, 2011 12:08 am
Forum: Number Theory
Topic: Math help!!!
Replies: 5
Views: 1513

### Re: Math help!!!

the possible 4 digits numbers are 1111,3333,5555,7777,9999.(sum of 3 odd squares is an odd number)
Fri May 20, 2011 12:04 am
Forum: Algebra
Topic: Smallest Perimeter of Quadrilateral With Equal Area
Replies: 10
Views: 2667

### Re: Smallest Perimeter of Tetrahedren With Equal Area

i have a different and very easy proof, i hope i will post it.
Fri May 13, 2011 12:53 am
Forum: Algebra
Topic: Smallest Perimeter of Quadrilateral With Equal Area
Replies: 10
Views: 2667