Can't wait to get rid of the Linear garbage. The numbers of the keypad don't even light up. Two tiny led's at the top don't provide much illumination.

I get figuring out which four keys are in the code but figuring out the sequence of those numbers takes some time and doing.

I THINK it would be 24 possible combinations, assuming you can only use each of the 4 numbers one time.
If you know the four digits used, AND you can only use each number one time, punching twenty four codes in is certainly doable.

Helen Keller had the same problem

Again, we're assuming 4 clean keys.

If you could repeat digits, that would increase the number quite a bit...4x4x4x4=256 possible combinations.

But since the scenario describes 4 clean keys, we're back to 24 because repeating numbers would leave fewer than 4 clean keys. :)

My keypad uses four digits and then you need to press any forth digit. I always pick a different key for the last digit.

Somebody count.................how many posters say 24 combinations and let everyone know how many more times this needs to be posted. Thank You. :popcorn:

Ohiobuckeye
 

Very honest friend! But the 4 symbols have a lot of combinations. But very good advice. From the 8 yrs. we lived there, I couldn’t believe how many dishonest contractors there were. This person is a good friend to have!

With 4 known keys of unknown order there are 24 possible codes. Most keypads lock you out for 30 to 60 seconds after entering a wrong code. I just checked my keypad (now 10 years old) and I cannot discern any difference on the keys. Not sure this is a real issue but it can't hurt to clean the keys as long as you do not get any liquid inside the device.

Almost
 

You almost got it….if the numbers can be repeated, then there are 10,000 possible combinations with 0-9 being the numbers.

10x10x10x10…or 10 to the 4th power.

FYI never eat BBQ chicken and this hit those keys. Your welcome...

I have accepted your request, and with some effort I found that there have been 9* posts emphatically saying the answer is 24.
Probably another 6 posts need to be posted.

Note: Not included in the above count was the one indicating 24.......that came after your post!
*All data subject to visual recount by qualified neutral third party.

I guess I should have been a little clearer.

There are 10,000 combinations of four numbers when numbers are used multiple times in a combination. And there are 5,040 combinations of four numbers when numbers are used only once.

I agree! I just don’t like people telling me (and Google) that I am wrong. Just trying to make sure all has informed and accurate information! :icon_wink: