Tough Sequence Riddle: If, 1 + 2 + 3 = 9 Then 5 + 6 + 7 = ?

• Bhavini


• 18 Dec 2015

Toughest Riddle ever.

If you are able to solve this you are a super-genius.

If,

1 + 2 + 3 = 9

2 + 3 + 4 = 2

3 + 4 + 5 = 8

4 + 5 + 6 = 9

Then,

5 + 6 + 7 = ?

If you can guess what comes next in the sequence you will be among the top 2 % of people who can actually solve this riddle.

Challenge your brains and start working.

If you get the answer right share it with your friends on WhatsApp and social media websites like Facebook and Twitter.

Answer:

The logic behind the riddle is as follows;

For explanation sake we consider the following euation;

a + b + c.

Now looking at the equations in the sequence, the first step is;

a + b + c = (ca,cb)

The second step is to keep adding the digits of the resultant number till it reduces to a single digit number.

Let’s try the first equation (1 + 2 + 3) with this logic for better uinderstanding

So applying first step we get;

1 + 2 + 3 = [(3 x 1),(3 x 2)] = 3,6 = 36

Applying 2nd step we get

3 + 6 = 9;

Similarly the same logic is true for all other equations

2 + 3 + 4 = (4 x 2),(4 x 3) = 812 = 11 = 2

3 + 4 + 5 = (5 x 3),(5 x 4) = 1520 = 8

4 + 5 + 6 = (6 x 4),(6 x 5) = 2430 = 9

So we can solve the last one to get the answer as;

5 + 6 + 7 = (7 x 5),(7 x 6) = 3542 = 14 = 5

Answer = 5