Write out the sequences like this:
S = 2 + 4 + 6 + 8 +…+ 200 S= 2 (1 + 2 + 3 + 4+…+100)
T = 1 + 2 + 3 + 4+…+100
By factoring out the 2 in S, you can see that S is twice the value
of T. That means you would have to add 100% of T in order to get
S (A).