Question

Find the first three terms of the sequence for which Sn =
n(n+1)/2​

Answer 1

Answer: 1, 3, 6

Step-by-step explanation:

S1 = 1(1+1)/2 = 1

S2 = 2(2+1)/2 = 3

S3 = 3(3+1)/2 = 6