### Brain Teasers

# Familiar Numbers

Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

What number comes next?

7, 4, 1, 8, 5, ?

7, 4, 1, 8, 5, ?

### Hint

Look down and to the right.### Answer

The next number is 2.If you go vertically down and from left-to-right on the numeric keypad on your keyboard, you will get those numbers. This is what a numeric keypad looks like:

7 8 9

4 5 6

1 2 3

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## Comments

This is my first brainteaser.

Nice brainteaser!

I was thinking of subtracting 3 to each number, since when you subtract 3 to 1, you get -8, but I saw no negative sign.

I was thinking of subtracting 3 to each number, since when you subtract 3 to 1, you get -8, but I saw no negative sign.

Nice teaser! I thought the pattern was -3 then +7....

7-3=4

4-3=1

1+7=8

8-3=5

5-3=2

7-3=4

4-3=1

1+7=8

8-3=5

5-3=2

Great teaser but I didn't have a keyboard in front of me since I did it on my iPad

I did it as Seven has 5 letters.

The next has 4 then 3.

Then i started again at Eight with 5 letters.

And so you would need another number with 3 letters, so i got TWO.

Its a sequence of 5-4-3, 5-4-3.

The next has 4 then 3.

Then i started again at Eight with 5 letters.

And so you would need another number with 3 letters, so i got TWO.

Its a sequence of 5-4-3, 5-4-3.

Interesting observation dancingrobots

I got it right, but I was going 'up' on my phone instead of 'down' on the keyboard...

I got it the same way as Demon. Good job. Fun but easy.

y r u named kronos? u no thatz the name of the evil Titan lord in the Greek stories? ugh

Jul 31, 2011

i got it right and yeh it was fun but easy

I have a laptop (which means 0 key pad)

mine ws a diff approach...dint any1 notice that the numbers in the series are those of the units place digits dat occur in the 7's table

In another way :

7 - 3 = 4

4 - 3 = 1

Now just imagine the numbers from 0 to 9 as a chain circle, so 0-1=9 and 4 - 7 = 7.

Then :

1 - 3 = 8

8 - 3 = 5

5 - 3 = 2

7 - 3 = 4

4 - 3 = 1

Now just imagine the numbers from 0 to 9 as a chain circle, so 0-1=9 and 4 - 7 = 7.

Then :

1 - 3 = 8

8 - 3 = 5

5 - 3 = 2

Well, I'm on a laptop. Got it anyway...thought about what a computer keyboard would look like.

On most keypads, 0 is directly below 1 (as a double-width key), so you could introduce 0 into the series to make it a little harder and throw off the mathematical reasoning.

7, 4, 1, 0, 8, 5, ...

7, 4, 1, 0, 8, 5, ...

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