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if 2=6, 3=12, 4=20, then 9=?? Only for Genius Puzzle – Number Series Puzzle #2

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Can you solve this Number Series Puzzle?

It seems like, you are a big fan of Math puzzles. Here we comes up with an interesting viral puzzle.

This “Only for Genius” puzzle looks very simple, Let see if you can find out the logic behind this viral puzzle.

Here is our Math puzzle Question:

if

• 2=6,
• 3=12,
• 4=20,
• 5=30,
• 6=42,

then 9=?? Did you find out the pattern behind this logical puzzle? The comment section is all yours, lets see what you got.

This Math puzzle can be solved by two ways:

First Way:

• 2 x 2 + 2 = 6
• 3 x 3 + 3 = 12
• 4 x 4 + 4 = 20
• 9 x 9 + 9 = 90

Second Way:

just multiply the number with next upcoming number. like if 2 is given, then 2 x 3 = 6 and so on. So if we have 9, then 9 x 10 = 90

• 2 = 6   (2 x 3)
• 3 = 12 (3 x 4)
• 4 = 20 (4 x 5)
• 5= 30 (5 x 6)
• 6 = 42 (6 x 7)
• 9 = ?  (9 x 10)

So in both case, our answer is 90

There may be many pattern to this puzzle and the answer depend upon the pattern you use. If you found another method, let us know via comment.

Hope you like this viral math puzzle. If you want some more interesting and brain teasers puzzles like this one, browse our Puzzle category and share these puzzles image in your circle and challenge your friends to solve these Genius puzzles.

Enjoy and Take care!

1. S Colditz

i saw a pattern. 4,6,8,10,12,14
2 + 4 = 6
6 + 6 = 12
12 + 8 = 20
20 + 10 = 30
30 + 12 = 42
42 + 16 = 56

• Sal Morabito

I saw the same pattern, but just in the answer. Where the difference in the answer starts with a factor of 6, and then each “answer” is increased by 2. Which makes 9=84. I’m glad I’m not the only one who saw it that way.

2. Diane Miller

I get 72. The numbers shown indicate the multipliers from top to bottom (where = sign is) are 3, 4, 5, 6, 7. The next number would be an 8. 9×8=72.

Diane

3. Kristi Dunlap

You can also say, doubling the number below and adding it to the answer above gives you the next answer…(3×2)+6= 12
(4×2)+12=20
(5×2)+20=30
(6×2)+30=42
(9×2)+42=60

4. Danzer

Result 60
right 6
6 + 6 = 12
12 + 8 = 20
20 + 10 = 30
30 + 12 = 42
= X

left 2 (+1)
3 (+1)
4 (+1)
5 (+1)
6 (+1)
9 (+3)

>> left to right
2 = 6
+ (2×3)
3 = 12 X
+(2×4)
4 = 20
+(2×5)
5 = 30
+ (2×6)
6 = 42
+ (2×9)
9 = 60

5. joseph

2=6. .+.6 =12
3=12. +.8 =20
4=20. +10 =30
5=30. +12 =42
6=42 .+14 =56
7=56. +16 =82
8=82. +18 =100
9=100 .+20 =120
___________________

second line even numbers to the answes…

6. OG

I saw a different pattern 5=30 6=42 7=56 8=72 9=90. Each answer goes higher by 2. 30-42 is 12,42-56 is 14, 56-72 is 16,72-90 is 18

7. Sella

2=6 –> difference is 4 –> 2*2
3=12 –> difference is 9 –> 3*3
4=20 –> difference is 16 –> 4*4
5=30 –> difference is 25 –> 5*5
6=42 –> difference is 36 –> 6*6
9=58 –> difference is 49 –> 7*7

• Ya…Sella Great Work This Is A Another Pattern I Never Thought So..!! Grr8 Thank You..!!

8. Gad

• Gad

2+4=6
3+9=12
4+16=20
5+25=30
6+36=42
9+49=58
Because:
4+5=9
9+7=16
16+9=25
25+11=36
36+13=49

• Ohh…!!! I SEE Now Another Pattern ….Great !!! Gad !! I M Glad It’s Math…So Many Solutions And Answers…!! 🙂

• If you see Left hand Side Numbers..Its Just One Of Patterns! 2*3= 6 Matches the RHS first No. 6
3*4= 12 Matches the RHS Second No. 12
4*5= 20 ” ” third No. 20
5*6= 30 ” ” Fourth No. 30
6*7= 42 ” ” Fifth No. 42

7 & 8 Are Missing So We Have to Go According to Pattern
So, 7*8= 56 ” ” Sixth No. Will Be 56
8*9= 72 ” ” Seventh No. will be 72
9=??? So, 9*10=90 ” ” Eight No. Will Be 90
So Ans Is 90.

• Gad

I don’t want to change the question.Such as adding in 7 or 8.The question is 2,3,4,5,6,9.

• Gad

I also have the same answer-90.But in another ways.
2*2+2=6
3*3+3=12
4*4+4=20
5*5+5=30
6*6+6=42
9*9+9=90
(Don’t change the question by adding other numbers.)

9. leonides acedo

Another solution is use the formula n+(n)to power 2 : where n is any number on left column .hence try n= 2 so 2 + (2) to power 2 = 6 , n=3 so 3+(3) to power 2= 12 , until n=9 so 9+(9)to power 2=90 anwer. therefore any positive number on left column, example if beginning number is 20 so 20 +(20)to power 2 =420. but negative number is not applicable to this formula.

10. Harry

If you multiple it:        2=6       2×3=6        3=12     3×4=12        4=20     4×5=20        5=30     5×6=30        6=42     6×7=42        7=56     7×8=56        8=72     8×9=72        9=??      9×10=90So your answer is 9=90. I got the answer by one number higher then the number before the equal sign. so 2×3, 3×4, 4×5 and so on. My work on the right show you how I got my answer.

11. Acktifhead

Or you can have the same result with an other way. The probleme come with a false equation 2=6 so it’s like you said 2 banana equal 6 apple, so 3 banana = 12 pears, ect you can deduct the paterns like this

2=6
3=12 (so last result +6)
4=20 (so last result +8)
5=30 (so last result +10)
6=42 (so last result +12)
7=56 (last result +14)
8=72 (last result +16)
9=90 (last result +18)

6,8,10,12,14,16,18

12. Hugh Ub Brown