The number of terms needed to get Sn = 0 in the A.P of 63, 60, 57. . . . .

The mean of the sample data = 60 and median = 48. Find the mode of this distribution.

If the standard deviation of a population is 3.5, what would be the population variance?

In an A.P 41st term is 50, then the sum of 81 terms of that A.P is:

The sum to n terms of the series 1 + 1 + 3 + 1 + 3 + 5 + 1 + 3 + 5 + 7 …………………… is

24, 29, 62, ?, 758, 3791

3600, 600, 120, 30, 10, ?

21 is divided into three parts which are in arithmetic progression (A.P.) in such a way that the sum of their square is 179. Find the smallest part.

What will be the mode of the following data?

13, 15, 31, 12, 27, 13, 27, 30, 27, 28 and 16