21^2

[@carlorff1965]

Of course 42.
It's the answer to the ultimate question of life, the universe, and everything.
Thanks to Douglas Adams.

[@abhishekahir8540]

Bruh! Just focus at the unit digit! Thats all! Why solving like that? Its a simple 2 second question for majority of aspirants

[@diegosimonetti5615]

(21^2 + 21^2 + 21^2 + 21^2)^1/2 =
(4 × 21^2)^1/2 =
2 × (21^2)^1/2 =
2 × 21 = 42 (risposta B)

[@giannaleoci2328]

rq(4•21^2)=2•21=42

[@mircoceccarelli6689]

👍

[@Eliasgemechu-q9z]

ua-cam.com/users/shortswCbzqEHpfzU?si=nkVWqitANXgASCUa

[@adgf1x]

?=2×21=42ans

[@Iamautisticperson]

42

[@kenhoo3702]

= √(4 ×(21^2)) = √((2^2)×(21^2))
= 2 × 21 = 42

[@shlomokashi]

42