Thread: 4 the maths lovers...??? help!!!

1. Originally Posted by shak
yup .. induction ...
Got to wait another year to know what that is

2. Originally Posted by dennis
ahem,
n(n-1)=48..and u say n= 48
if n= 48 then n(n-1) =48*47 and not 48...caught u there

the answer is between 8 and 7 cuz for 8 n(n-1) =56 and for 7 its 42

I m losing my patience now !!

Evo guy did it right ... perfectly logical way of going about in such questions !!

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Originally Posted by Knight_ki_gf
Ahem ahem !!

I was the topper in Maths in school... even in graduation!!
and fortunately unfortunately i specialised in Maths teaching !!

I beg to differ with that abbreviation !!

seems an exception jus like the great "Shakuntala Devi"
coz in my school days grlz usually top subjs like "histry/geography/english/hindi"

4. Originally Posted by Evo Guy 911
Dudes I can prove that equation wrong. See this:
n^2 - n -41 = never divisible by 7
To prove it wrong, we have to prove that for a certain value of n, the answer must b divisible by 7. So we work counter-clock wise, we put the equation equal to anything divisible by 7. Now watch:
n^2 - n - 41 = 7
=> n^2 - n = 7+41
=> n(n-1) = 48
Now either n=48, or (n-1)=48. So we put n=48 in the above equation

48^2=2304

48^2 - 48 - 41=7
2215=7 (I know it doesn't sound right, but for the time being.....)

When we divide 2215 by 7, it gives 316.428. Not a whole nmber. Now try the other equation. i.e., n-1=48 => n=47

Putting in equation:

47^2=2209

47^2 - 47 -41=7
2209 - 47 - 41=7
2121=7

This solves to give the answer 303. A perfect whole number. I know nobody asked for a proof, Just for the fun...... Peace

** Clap !!

Perfect !!

10 on 10

5. Originally Posted by can_i_play
seems an exception jus like the great "Shakuntala Devi"
coz in my school days grlz usually top subjs like "histry/geography/english/hindi"

when i tell people that i scored meagre 32 in class VII and rose to 99 in Class X and continued the same till graduation....people dont believe...

I dont say i m brainy... but I had an excellent teacher (Tutor)
He made me fall in love with Maths....(figure of speech plzzz !!)
It all depends on who teaches you and how you are being taught .... simple !!

Was pathetic at Hindi.... never took hindi for class X
Was bad at history geography and stuff... scored the least in Social studies in Class X... it ruined my percentage

6. wtf? You being a math wiz and saying that n(n-1) = 48 would mean that either of the two is equal to 48 indicates that you are lying or just take jokes a tad too far.

7. Originally Posted by can_i_play
assuming x is divisible by 7
therefore
(x-7)(x+7)(y)=0, when y is any number greater not equal to 0
therefore x2-49 =0
now where did you get this from ?? (x-7)(x+7)(y) = 0??

i m trying to understand your solution...

8. Originally Posted by bjr
wtf? You being a math wiz and saying that n(n-1) = 48 would mean that either of the two is equal to 48 indicates that you are lying or just take jokes a tad too far.
well bjr... in proofs thats how you u go about it...

u assume either of the two to be equal to 48,... if you are able to prove the equation for any one ...then the solution holds good for that particular value...

I know it well what i m supporting !!

9. Originally Posted by Knight_ki_gf
well bjr... in proofs thats how you u go about it...

u assume either of the two to be equal to 48,... if you are able to prove the equation for any one ...then the solution holds good for that particular value...

I know it well what i m supporting !!

Now I'm unsure about my own memory since you seem to be so sure....oh well.

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if a number is divisible by x it is also divisible by its -negative coz the quotient will be - of the other quotient ,,,

and y is any real number ....that compensates for other factors....

11. Originally Posted by can_i_play
if a number is divisible by x it is also divisible by its -negative coz the quotient will be - of the other quotient ,,,

and y is any real number ....that compensates for other factors....
oh ohk.... got ur point !!

12. ^ Do you know the proof of 1+1=2 (just out of curiousity)??

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Originally Posted by Knight_ki_gf
oh ohk.... got ur point !!
..

but now i m confused have i used it correctly...

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Originally Posted by Knight_ki_gf
well bjr... in proofs thats how you u go about it...

u assume either of the two to be equal to 48,... if you are able to prove the equation for any one ...then the solution holds good for that particular value...

I know it well what i m supporting !!

it is assumed bcoz of some reason....

and reason is the product is 0 in such cases not else...

coz xy =0
can only happpen if either is 0..

15. Originally Posted by can_i_play
..

but now i m confused have i used it correctly...
explanation of (x-7)(x+7) was good... but what i m wondering is why have you used it there??

wats the context??

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