Consider an infinite geometric series with first term a and common ratio r. If its sum is 4 and the second term is 3/4, then
a = 3, r = 1/4
is not given in any of the four choices so we chose only r = 1/4.
Then x =
Third term of a G.P > is 4. The product of first five terms is
The harmonic mean of the roots of the equation
Let the positive numbers a, b, c, d be in A. P. Then abc, abd, acd, bcd are
The sum of the series 1/2 + 1/3 + 1/6 +……. to 9 terms is