Find the sum of the following series up to n terms: (i) 5+55+555+…(ii) .6+.66 +. 666+…
Let S be the sum, P the product and R the sum of reciprocals of n terms in a G.P. Prove that P2Rn = Sn.
If \(\frac{ a + bx }{ a - bx }= \frac{b + cx }{ b - cx} =\frac{ c + dx }{ c - dx }(x ≠ 0),\) then show that a, b, c and d are in G.P.