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A FIRST and SECOND Problem (Posted on 2006-08-22) Difficulty: 2 of 5
There are n retailers and each of them have copies of two novels left, titled “FIRST” and “SECOND”. Each retailer has a different number of copies of "FIRST", which is always more than the number of copies of "SECOND" stocked by that retailer.

It is observed that the sum of squares of the number of copies of FIRST and the number of copies of SECOND for each of the retailers is always equal to:

For example, if the respective number of copies of FIRST and SECOND titles possessed by any given retailer i are xi and yi, then :
xi2+yi2 = (22+32)(32+42)(42+52); for all i = 1,2,....,n

How many retailers are there and how many copies of FIRST novel in total are available from all these (n) retailers?

See The Solution Submitted by K Sengupta    
Rating: 4.0000 (1 votes)

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Some Thoughts re: An idea, with no computer Comment 5 of 5 |
(In reply to An idea, with no computer by Old Original Oskar!)

Since 3^2+4^2=0^2+5^2, you could also try c=0 and d=5, I think. It's not clear to me, however, whether you'd get all possible solutions using these formulas.
  Posted by Federico Kereki on 2006-08-25 08:58:41

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