This is for mathematics. The person who answers correctly will get a medal and be followed.

A group of students is arranging squares into layers to create a project. The first layer has 6 squares. The second layer has 12 squares. Which formula represents an arithmetic explicit formula to determine the number of squares in each layer?

f(1) = 6; f(n) = 6 + d(n − 1), n 0
f(1) = 6; f(n) = 6 ⋅ d(n − 1), n 0
f(1) = 6; f(n) = 6 ⋅ d(n + 1), n 0
f(1) = 6; f(n) = 6 + d(n + 1), n 0

Question

This is for mathematics. The person who answers correctly will get a medal and be followed.

A group of students is arranging squares into layers to create a project. The first layer has 6 squares. The second layer has 12 squares. Which formula represents an arithmetic explicit formula to determine the number of squares in each layer?

f(1) = 6; f(n) = 6 + d(n − 1), n > 0
 f(1) = 6; f(n) = 6 ⋅ d(n − 1), n > 0
 f(1) = 6; f(n) = 6 ⋅ d(n + 1), n > 0
 f(1) = 6; f(n) = 6 + d(n + 1), n > 0

Vengeance · Answer

f(1) = 6; f(n) = 6 + d(n − 1), n > 0

Vengeance · Answer

Yeah, I know direct answers are not allowed, but a lot of people are doing it still.