On 03/13/2010 02:00 PM, Moshe Okman wrote:
> I like to suggest something to solve this problem.
>
> The car number is a four digit number which can be represented in the
> following manner:
>
> 100 * 11 * K + 11 * L = X ^ 2
>
> Since the 4 digit number has two parts and each of them divides by 11 it
> means that X must be a multiplication of a constant by 11 (the prime
> factor).
>
> This conclusion leaves us with the following possible values for X {11, 22,
> 33, 44, 55, 66, 77, 88, 99}.
>
> A three digit X value which is a multiplication of 11 will yield a square
> value of 5 digits ( 10*11 )^2=12100.
>
> The square value of the first two entries in the list (e.g. 11, 12) gives a
> three digit result. 121 and 484.
>
> This leaves us with 7 numbers of which the square value will be: 1089, 1936,
> 3025, 4356, 5929, 7744 and 9801.
>
> It looks like the answer you look for hides somewhere in this list.
>
> Moshe
>
>
>
>
>
> _____
>
> From: do_right [mailto:wolexzo2-/[email protected]]
> Sent: Saturday, March 13, 2010 7:24 PM
> To: [email protected]
> Subject: [c-prog] Re: PLZ SOLVE THIS :
>
>
>
>
>
>
>
> --- In c-p...@yahoogroups.<mailto:c-prog%40yahoogroups.com> com, "Rakibul
> Islam"<rakib.uiu_...@...> wrote:
>>
>>
>>
>> Three brilliant school girls walking along see a car hit a cyclist and
> fled away. They report the matter to the police like this :
>>
>> Girl 1: I couldn't see the entire number of the car, but I remember that
> it was a four digit number and it's first two digits were divisible by 11
>>
>> Girl 2 : I could see only the last two digits of the car's number, and
> they two formed a number divisible by 11.
>>
>> Girl 3 : I saw the hole number but i forgot. But I am sure that the whole
> number was a perfect square.
>>
>> Can you help the police trace the car by a C program?
>>
>
> No I can't. But first, the girls are not brilliant at all, probably pyscho.
> They are trying to cover up a crime here by coming up with this maths.
> The police should interrogate them further and charge them with ...
>
> </sacarsm>
>
> A logic might be to run through perfect squares (with four digits)
> http://en.wikipedia<http://en.wikipedia.org/wiki/Square_number>
> .org/wiki/Square_number
> and check the divisibility of the first two and last two digits.
>
> Lawal.O
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
You don't need a C program for this. Based on the list you've provided
and the requirements made in points 1-3 you can deduce the answer from
your list of numbers. I've already found the answer in that list.
i.
