A harmonic progression is a sequence of numbers such that their reciprocals are in arithmetic progression.
Let Sn represent the sum of the first n terms of the harmonic progression; for example S3 represents the sum of the first three terms. If the first three terms of a harmonic progression are 3,4,6, then:
<spanclass=′latex−bold′>(A)</span>S4=20<spanclass=′latex−bold′>(B)</span>S4=25<spanclass=′latex−bold′>(C)</span>S5=49<spanclass=′latex−bold′>(D)</span>S6=49<spanclass=′latex−bold′>(E)</span>S2=21S4