The nine numbers 20, 26, 33, 35, 39, 42, 44, 55 and 91 are divided into three groups, so that the product of the three numbers in each group is equal Seek answers

The nine numbers 20, 26, 33, 35, 39, 42, 44, 55 and 91 are divided into three groups, so that the product of the three numbers in each group is equal Seek answers

The product of three groups was 60060
First of all, there are three multiples of 11. 33, 44, 55
In three groups, the product of the remaining two numbers in each group is
（1）33 1820
（2）44 1365
（3）55 1092
Then the corresponding groups are
（1）33,91,20
（2）44 ,35,39
（3）55,26,42

19 = 1 × 9 + (1 + 9) 29 = 2 × 9 + (2 + 9) 39 = 3 × 9 + (3 + 9)

19=1×9+(1+9)
29=2×9+(2+9)
39=3×9+(3+9)
n9=nx9+(n+9)