[ Solved ] Why code output is 33?

Question

Practicing what I learned with Ruby challenges. Have no idea why the code output is - 33?

Below is the screenshot of challenge:

https://www.sololearn.com/post/593067/?ref=app

Answer 1

a = 0
for i in (10..12)
a+=i
end

=begin
10.times do
at+=1
=end

puts a

for i in (10..12)
this for loop gives 10, 11, 12

a+=i
this line adds (a=10+11+12) and hence equals to 33.

anything between
=begin
.
.
.
=end

are comments.

Answer 2

Thanks RKK !
I understood it later while learning from tutorial the difference between ".." 2 dots and 3 dots "..." with the given value 😅