What is the sum of 2n-1 from 1-19 in geometric sequence?

For the given sequence 2n-1,

Let n=1 , so the first term of the sequence =

For n=2, the second term of the sequence=

For n =3, the third term of the sequence =

Similarly, for n= 19, the last term of the sequence =

Therefore, the sequence is

Since the common difference of the sequence formed is 2 which is same throughout the sequence. Hence, it forms an arithmetic progression.

Sum of arithmetic progression is given by =

where 'a' is the first term and 'l' is the last term of the given sequence.

Sum=

=

idk

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the answer is b