Six boys and six girls sit in a row. The probability that the boys and girls sit alternately will be
None of these
In a regular hexagon, 3 vertices out of 6 are randomly chosen. The probability that the triangle formed out of these three vertices will be an equilateral triangle, is
If two lines of regression are 3x + 12y = 19 and 9x + 3y = 46, then the value of rxy will be
0.289
- 0.289
0.209
None of these
Which of the following is not an output device ?
Projector
Speaker
Printer
Mouse
D.
Mouse
Mouse is not an output device.
If a, b, c are in arithmetic progression, then will be in
arithmetic proression
geometric progression
harmonic progresssion
None of the above