Discover pattern

Question

9 18 27 _ _ _ _ 

 

so are the adding 9 to each number ?   9+9= 18

     9+18= 27

      9+ 27= 36

Answer 1

You are correct Misha.  Another way to look at this is

the multiples of 9:  Starting at n = 1, a_n = 9n

This way you can immediately find any element
of the set.

What would be the 11th element?
a₁₁ = 9(11) = 99

Answer 2

YES !!!!

Very good

Well done Misha!