Show that there exists a $10 \times 10$ table of distinct natural numbers such that if $R_i$ is equal to the multiplication of numbers of row $i$ and $S_i$ is equal to multiplication of numbers of column $i$, then numbers $R_1$, $R_2$, ... , $R_{10}$ make a nontrivial arithmetic sequence and numbers $S_1$, $S_2$, ... , $S_{10}$ also make a nontrivial arithmetic sequence. (A nontrivial arithmetic sequence is an arithmetic sequence with common difference between terms not equal to $0$).
Problem
Source: Simurgh 2019 - Problem 1
Tags: arithmetic sequence
J25201
24.02.2019 16:27
Given any $R_1$, $R_2$, ... , $R_{10}$ and $S_1$, $S_2$, ... , $S_{10}$, if $R_1\cdot R_2 \cdot ... \cdot R_{10} = S_1\cdot S_2 \cdot ... \cdot S_{10}$, then we can solve for the numbers in the table.
ubermensch
24.02.2019 16:49
ubermensch wrote: This works Just take table 1 2 2 3 and then add diagonals 10,14,18,...,38 and make everything else 1.
SinaQane
24.02.2019 18:41
ubermensch wrote: This works Numbers are distinct.