The value of the infinite product $${6^{{1 \over 2}}} \times {6^{{1 \over 2}}} \times {6^{{3 \over 8}}} \times {6^{{1 \over 4}}} \times ...$$ is

If the nth term of an AP is $${{3 + n} \over 4}$$, then the sum of first 105 terms is

If p, q, r are in one geometric progression and a, b, c are in another geometric progression, then ap, bq, cr are in

What is the sum of n terms of the series $$\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + ...$$?