In the geometric pattern below, n represents the number of blocks in the bottom row of each figure,
n
=
1
n = 2
n
=
3
n
=
4
write a function that models the total number of blocks in terms of n.
a f(1) = 1; f(n) = f(n − 1) + n; for n = 2
b. f(1) = 2; f(n) = f(n − 1) + 4n; for n > 2
c f(1) = 2; f(n) = f(n − 1) + 2n; for n > 2
d. f(1) = 1; f(n) = f(n − 1) + 2n; for n > 2