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shubhamsrg
 4 years ago
if [x] denotes greatest integer < or = x ,
then prove that
C(n,3)  [ n/3 ]
is a natural no. , divisible by 3 for all integer n> or =3
shubhamsrg
 4 years ago
if [x] denotes greatest integer < or = x , then prove that C(n,3)  [ n/3 ] is a natural no. , divisible by 3 for all integer n> or =3

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shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0C(n,3) here denotes comination, for e.g. C(4,3) = 4! / (43)! (3)! likewise..

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1dw:1345190132115:dwdw:1345190209186:dw n can have only 3 from ... 1) 3k 2) 3k+1 3) 3k+2

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0am all years..what next ?

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1dw:1345190372362:dw this is just a try man ... i never know the solution beforehand.

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0that 4 wont be there in the last step...anyways nice... it'll be always divisible by sine its 9*something..and one of k and k1 is always even so the 2 cancelled out..thus 3k satisfies it.. nice..

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0i meant it'll always be divisible by 3**

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1lol ... how ... you always need k of the form to be k, k  1, k  2

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1Oh ... sorry ... such a huge error!! :(((

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1same thing repeats in other cases .. since you have three terms of m, m+1, m+2 < one of them is going to be divisible by 3

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1and that [n/3] thing is not going to change.

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0excellent,,thans a lot :)

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1not really ... i guess i should get some more sleep :)

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.0yeah you must be tired..go and relax..even very sharp minds need sound sleep! ;)
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