Consider the arithmetic series: 1+9+17+25+ a formula for the sum of the 1st n terms in this series. a)4n2 - 3n b)6n2 - 7n c)8n2 - 5n d)10n2 - n

1st nth sum is given by:
n    Sum                           Expression
1     1                           --- 4*1^2 -3*1
2     1+9 = 10               --- 4*2^2 -3*2
3     1+9+17 = 27         --- 4*3^2 -3*3
4     1+9+17+25 = 52   --- 4*4^2 -3*4

Therefore, the best expressions is;
Sum of 1st nth terms = 4n^2 - 3n

Then,
The correct answer is A.