## Sylhet - 2014

For students of class 9-10 (age 14-16)
Mahfuz Sobhan
Posts: 25
Joined: Sat Feb 07, 2015 5:40 pm

### Sylhet - 2014

$${x} = {m} \times ({m} + 1) \times ({m} + 2) \times ({m} + 3) \times ........ ....\times ({3m} - 1) \times {3m}$$. Here ${x}$ is divisible by ${3}^{k}$, if
m=1000 then find the maximum possible value of k.
Last edited by Mahfuz Sobhan on Wed Jul 08, 2015 2:59 pm, edited 6 times in total.

seemanta001
Posts: 13
Joined: Sat Jun 06, 2015 9:31 am
Location: Chittagong

### Re: Sylhet - 2014

Since $x$ is divisible by $3k$, the maximum possible value of $3k$ will be $x$.
So, the maximum value if $k$ will be $x/3$.
We can also write it as $m^2(m+1)(m+2)(m+3)....(3m-1)$.
So, in this case the maximum value of $k$ will be $1000^2$x$1001$x$1002$......x$2999$.
"Sometimes it's the very people who no one imagines anything of who do the things no one can imagine"

Tahmid
Posts: 110
Joined: Wed Mar 20, 2013 10:50 pm

### Re: Sylhet - 2014

Mahfuz Sobhan wrote: Here x is divisible by 3k, if
not $3k$ . it was ${3}^{k}$ in the main problem .
mahfuz sobhan you can use latex to avoid this type of mistakes.
Attachments problem
mu.PNG (19.22 KiB) Viewed 1220 times

samiul_samin
Posts: 1004
Joined: Sat Dec 09, 2017 1:32 pm

### Re: Sylhet - 2014

Mahfuz Sobhan wrote:
Tue Jul 07, 2015 2:45 am
$${x} = {m} \times ({m} + 1) \times ({m} + 2) \times ({m} + 3) \times ........ ....\times ({3m} - 1) \times {3m}$$. Here ${x}$ is divisible by ${3}^{k}$, if
$m=1000$ then find the maximum possible value of $k$.
Use floor function to get the answer.