Question

Let a_n be the n^th term of a G.P. of positive terms. If  ∑a_{2n  + 1} for n∈[n=1, 100] = 200 and ∑a_2n for n∈[n=1, 100] = 1000, then ∑a_n for n∈[n=1, 200] is equal to

(1) 225 

(2) 175 

(3) 300 

(4) 150

Answer 1

Answer is (4) 150

Answer 2

Answer is (4) 150