# Challenge: What is common between the following...

#### 3dhomejoe

##### Member
What is common between the following sets of numbers (No its not a product key for any software, eventhough it looks like one, I just made this program that would give the random numbers, but what do they have in common?)

7386-3170-2773-3508-0461-8014-42

4570-5177-0781-4030-5762-7232-43

2402-5838-3800-7066-6357-1508-03

If you want more numbers I have the .exe file for people to download if you really trust exe's in the attachment, View attachment Random Number.zip however I am not responsible if my random number generator program causes your computer to burst into flames while it grows legs and runs out your front door...

Post what you think is the answer and after a while, if no-one has it I will post the answer.

#### wongers

##### New Member
you dont use the number 9

#### ChatIndia

Community Support
sum of all the numbers is equal of 100

Edit:

7+3+8+6+3+1+7+0+2+7+7+3+3+5+0+8+0+4+6+1+8+0+1+4+4+2 = 100

4+5+7+0+5+1+7+7+0+7+8+1+4+0+3+0+5+7+6+2+7+2+3+2+4+3 = 100

2+4+0+2+5+8+3+8+3+8+0+0+7+0+6+6+6+3+5+7+1+5+0+8+0+3 = 100

Last edited:

They all have 7

#### 3dhomejoe

##### Member
sum of all the numbers is equal of 100

Edit:

7+3+8+6+3+1+7+0+2+7+7+3+3+5+0+8+0+4+6+1+8+0+1+4+4+2 = 100

4+5+7+0+5+1+7+7+0+7+8+1+4+0+3+0+5+7+6+2+7+2+3+2+4+3 = 100

2+4+0+2+5+8+3+8+3+8+0+0+7+0+6+6+6+3+5+7+1+5+0+8+0+3 = 100

correct #### descalzo

##### Grim Squeaker
Community Support
As pointed out, they also do not use '9', which might indicate an error in your code.

#### 3dhomejoe

##### Member
As pointed out, they also do not use '9', which might indicate an error in your code.
Ah yes, I typed in the wrong number when I made the program, I should have put 10 and not 9....

After fixing the code I got "2231-6660-4400-6693-4322-7547-35" and that should also add up to 100 unless I typed it wrong :/

#### luckyjoestar99

##### New Member
I have a riddle of my own for all of you:

If 2 × 9 = 12 and 2 × 8 = 10, what is 2 × 7?