What is the value of the second row?

[

[

[

ö

= 11

ö

Y

ö

Ù

= ?

Ù

Y

Ù

Ù

= 11

ö

ö

ö

[

= 9

= 8

= 21

= 8

= 7

This is a mathematical challenge, and it’s been said that:
* If you’re an engineer, you should be able to solve it in (under) three minutes,
* if you’re an architect, in three hours;
* if you’re a doctor, in six hours;
* if you’re an accountant, in three months and
* If you’re a lawyer, probably never.

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