Solve this puzzle if you can!

[Loki]

Apparently, only 1 in 1,000 people get this right. I got it within about 15 seconds.


1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
8 + 11 = ?

Good luck!

[B01AB20]

40

[cosmoo]

96

[Marzipan]

I also got 96

[Also]

40.

They surely lied about this only 1 in a thousand people got it right.

[Porn Master]

1 + 4 = 5
5 + 2 + 5 = 12
12 + 3 + 6 = 21
21 + 8 + 11 = 40

or

(4 * 1) + 1 = 5
(5 * 2) + 2 = 12
(6 * 3) + 3 = 21
(11 * 8) + 8 = 96

[Sui Generis]

21+19=40

[Dandelion]

The answer is 40!

Only 1 in 1,000? I don't believe it.

1 + 4 = 5
5 + 2 + 5 = 12
12 + 3 + 6 = 21
21 + 8 + 11 = 40

or

(4 * 1) + 1 = 5
(5 * 2) + 2 = 12
(6 * 3) + 3 = 21
(11 * 8) + 8 = 96

I see. So our answer is incomplete. Not that I couldn't have got to that alternative, but most people usually stop at the first pattern they see and don't look further.

[Casandrinos]

40 i think

I don't see the importance of these patterns tbh

Are they a legit thing in Math? (excuse my ignorance)

[Marzipan]

I didn't do any exhausting math. I did basic order 123.....+4567.... and the answers were adding prime numbers 7,9,11....

Is it suppose to complicated, I'm so lazy.