Find the partial sum of the arithmetic sequence that satisfies the given conditions. A=3 d=5 n=20

Answer 1

The formula for the partial sum of an arithmetic sequence is:

S_n = n/2(2A + (n-1)d)

Plugging in the values given:

S_20 = 20/2(2*3 + (20-1)*5)
S_20 = 10(6 + 95)
S_20 = 10(101)
S_20 = 1010

Therefore, the partial sum of the arithmetic sequence with A=3, d=5, and n=20 is 1010.