The first option is your answer.
Sigma notation is just a fancy way to shorten a sum of a series of numbers using a set equation. The "n =" tells you where to start in the sequence and the top number tells you where to stop.
2190.5 cm.
360 degrees - 23 degrees = 337 degrees
337 degrees x 6.5 cm = 2190.5 cm

Let's solve ~
Here, 6x is present on both the sides of equation so they cancel out ~ therefore there is no one solution satisfying the equation ~
What is that other number to the right of the red and I can answer it