If the 3rd term of an A.P. is 1/5 and the 5th term is 1/3, then the 15th term of the series is

If the 3rd term of a geometric progression is 2, then the product of first 5 terms of the series is

What is the 30th term of the following arithmetic series? 4, 8, 12, 16, ...

If S = ∑(2n+(1/2)), n=(1 to 10), then S is

If the sum the first 11 terms of an arithmetic progression equals that of the first 19 terms, then the sum of first 30 terms will be

Along a 300 m long road, 16 electric poles are fixed at equal distances, one pole being at each end of the road. What is the distance between two consecutive poles?