H1,H2 are 2 H.M.’s between a,b then H1+H2H1.H2=
The correct option is C a+bab
Given,H1H2 be the two H.M's
and lets say a,H1,H2,b be is a harmonic progression.
And 1a,1H1,1H2,1bin corresponding A.P after taking reciprocals.
And we know that in A.P. r=T2−T1=T3−T2....
Hence, option (C) is the correct answer$