1.
Let ana_n be the nthn^{\text{th}} term of a G.P. of positive terms. If n=1100a2n1=200\sum\limits_{n=1}^{100} a_{2n-1} = 200 and n=1100a2n=100\sum\limits_{n=1}^{100} a_{2n} = 100, then n=1200an\sum\limits_{n=1}^{200} a_n is equal to