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# Fun Math Brainteaser

Earlier, I published Viral Puzzle – Which glass gets full first? on our Facebook page. It went instant viral, 80% answers on this puzzle were wrong. I have another tricky math puzzle for you. You will enjoy solving this fun math brainteaser.

Let’s see if you can find the correct answer.

Also Try: Cookie Banana Clock Puzzle

Once you have solved this puzzle then scroll down to find correct answer. Match your answer and see if you have solved it correctly 🙂

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### Answer: 99

Explanation:

(3*2) + 1 = 7

(5*4) + 3 = 23

(7*6) + 5 = 47

(9*8) + 7 = 79

(10*9) + 9 = 99

There is one more pattern for this puzzle and with that pattern answer would be 98.

(3*2) + 2 – 1 = 7

(5*4) + 4 – 1 = 23

(7*6) + 6 – 1 = 47

(9*8) + 8 – 1 = 79

(10*9) + 9 – 1 = 98

Make use of comment section if you think answer should be something else then what I have published here. Please like our Facebook Page for more such puzzles and brainteasers.

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## By Kumar

Hi All, I am Ramesh Kumar, author of this blog. I am an IT engineer. I love puzzles and riddles so I decided to publish the same for others like me. If you like puzzles then do subscribe to my email listing. You can also follow me through the website Facebook page . If you like to contact me then use the contact page form, I will reply to your emails ASAP. Thanks

## 4 replies on “Fun math brainteaser”

Hi Kumar

I think the answer is 98; not 99.
Ie 10×9 + (9-1)

This formula fits all lines. There is a disruption to the pattern between the last two lines.

Your method would be correct if the last line was continuing the pattern (ie: was 11 x 10 instead of 10 x 9)

Have a great day
Nancy

Kumarsays:

Thank You Nancy. I will add your answer also in this post 🙂 . I think answer can be both 98 or 99.

Lianesays:

The answer to both is 99. The puzzle done the first way only uses odd numbers when adding….(3×2)+1=7 next adds the number 3, then 5, 7, and 9. The puzzle done the second way only uses even numbers when adding, then minuses the number 1…. (3×2)+2-1=7 so next adds the number 4, then 6, 8 making the last number to add 10. (10×9)=90+10=100-1=99..so staying with your formula, the answer is always 99.

I'm bettersays:

2n(2n + 1) + 2n – 1 = 4n² + 4n – 1, n Є N U {0}.
Answers:
n(0) —> -1
n(1) —> 7
n(2) —> 23
n(3) — > 47
n(4) —> 79
n(5) —> 119
n(6) —> 167