Answer :
Manny, this is the solution to the arithmetic sequence:
Sum = 1 + 3 + 5 + 7 + 9........+ 59
d = 2 (Common difference)
An = 2n - 1
A1 = 1
n = 59 + 1 /2 (Last number of the sequence plus 1 and the result divided by 2)
n = 30
Therefore, we use the arithmetic sequence sum formula:
n (A1 + d (n - 1)/2)
Replacing by the values we know:
30 (1 + 2 (30 - 1)/2)
30 * 30
900
The sum of this arithmetic sequence is 900