In a geometric sequence, the 23rd term is 16 and the 24th term is 1/4. What is the 30th term?
16r = 1/4
r = (1/4) / 16 = 1/64
30th term is (1/4) r^6 = (1/4)(1/64)^6 = (1/4) ( 1/4^3) ^6 = (1/ 4)^19 = 0.000000000003638
+1212 
