Can you solve this puzzle?

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Solve this logic number sequence puzzle by guessing the correct digit:

f ( 8080 ) = 6 f ( 1357 ) = 0 f ( 2022 ) = 1 f ( 1999 ) = 3 f ( 6666 ) = ? \begin{aligned} f(8080) &= 6 \\ f(1357) &= 0 \\ f(2022) &= 1 \\ f(1999) &= 3 \\ f(6666) &= \text{ ?} \end{aligned}

Image credit: Wikipedia Gelada


The answer is 4.

Vaibhav Kandwal by Vaibhav Kandwal , 21, India

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18 solutions

Discussions for this problem are now closed

Mehul Arora
Jan 12, 2015

The number on the right is actually the number of "holes" in the number on the left.

8080= 6 holes, 2 in each 8 and 1 in each 0

Hence, 6666=4 1 hole in each of the 4 sixes.

Cheers! :)

48 Helpful 0 Interesting 0 Brilliant 0 Confused

This is harder than the petals around the rose.

Roman Frago - 6 years, 4 months ago

Yeah!I never did such difficult question before but It was a mistakes that I never think of holes and circles!Well,I keep on wondering why there is a donut with three holes.

Frankie Fook - 6 years, 4 months ago

Brilliant question!!

Parth Lohomi - 6 years, 4 months ago

You can call it either holes or circles in a number

Vaibhav Kandwal - 6 years, 5 months ago

Not understand at all. Can'explain it much clearly?

Sonal Singh - 6 years, 4 months ago

This is similar to the "polar bears around a drinking hole" problem

George Zhou - 6 years, 4 months ago

Might Be....

Vaibhav Kandwal - 6 years, 4 months ago

Very nice question

kritarth lohomi - 6 years, 4 months ago

@Kritarth Lohomi – Thanks friend

Vaibhav Kandwal - 6 years, 4 months ago
Angela Fajardo
Jan 16, 2015

Just count the number of circles/holes in the given number

8080 = 6 (has 6 holes/circles , 2 holes/circles per number eight and 1 hole/circle per number zero

1357 = 0 (has 0 holes/circles)

2022 = 1 (has 1 holes/circles , 1 hole/circle of number zero)

1999 = 3 (has 3 holes/circles , 1 hole/circle per number nine)

6666 = 4 (has 4 holes/circles , 1 hole/circle per number six)

7 Helpful 0 Interesting 0 Brilliant 0 Confused

very nice answer

hamza sajjad - 6 years, 4 months ago
Nax Alpha
Jan 17, 2015

Take each digit of left numbers and add them e.g. In first column you will get

8+1+2+1=12/2=6

Similarly for 2nd column

0+3+0+9=12/2=6

For 3rd column we write

8+5+2+9=24/4=6

And for 4rt column it is

0+7+2+9=18/3=6

Thus for answer column

6+0+1+3=10%6=4

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Your answer seems most logical. Cheers. :)

Mahmood Sheikh - 6 years, 4 months ago
Raymar Laconsay
Feb 10, 2015

count the cirles in each given numbers ..... -_- !

1 Helpful 0 Interesting 0 Brilliant 0 Confused

count the holes!

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Its hard to understand

Sonal Singh - 6 years, 4 months ago
Christian Melmida
Mar 23, 2015

Orange Genus 3 Surface= 3holes 8080= 6holes 1357= theres no hole so its zero 2022= 1hole 1999= 3holes and 6666= 4holes yes i got the logic behind that... :)

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Aran Pasupathy
Feb 26, 2015

Great problem!!

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Ibraheem Akram
Feb 6, 2015

This is a trick question. It's not about what we typically think of as a sequence. It's simply counting the number of circles in the numbers. 6666 has four circles.

The number 8 is two circles

A zero is one

Both 6 and 9 have one circle each.
. 6666 = 4

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Khaled Magdy
Feb 3, 2015

if 2022 = 1 so 0=1 and any shape close to the shape of zero like ; 1999=3 as there is 3 nines and 9 has shape close to 0 exactly the 6 so 6666= 4

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Jim Gao
Jan 29, 2015

Holes. Just holes.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Wow... I never thought of that solution... but I got it right.... The first thing that got in my mind was how many were the same digits... but when I read the solutions... I remembered that... hehehe

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Chaudhry Ahmer
Jan 24, 2015

Holes in numbers

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Ayan Dutta
Jan 21, 2015

it is a problem of my choice

0 Helpful 0 Interesting 0 Brilliant 0 Confused

easy one!!

0 Helpful 0 Interesting 0 Brilliant 0 Confused

The number of holes in each number set is the answer

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Nagesh Setty
Jan 16, 2015

No. Of loops in given number

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Tanmay Goyal
Jan 16, 2015

Really,it is a nice prblm..

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Mark cBrown
Jan 15, 2015

Holy Moly!

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Cryptography isn't my cup of tea, I'll take a math problem anyway.

Christopher Nguyen - 6 years, 4 months ago

This is an amazing question but makes us so critical to think.

Dider Wood - 6 years, 2 months ago

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