If 3x + 5y + 7z = 49 and 9x + 8y + 21z = 126, then what

At a round table, n persons are seated on n chairs. The probability that two friends from same college are sitting next to each other, is:

The deseasonalised time - series data will have only trend (T), cyclical (C) and irregular (I) components and is expressed as:

The grouped data for the observation are as follows.

These seventh decile (D7) of data set 4, 3, 10, 9, 1 is

The coefficient of correlation is the _________ of coefficients of regression.

Five persons A, B, C, D and E occupy seats in a row at random. The probability that A and B sit next to each other is:

Which option is WRONG?

Which option is incorrect for the component of ti.me series.