A speaks truth in 60% of the cases, while B is 40% of the cases. In what percent of cases are they likely to contradict each other in stating the same fact ?
From a lot of 6 items containing 2 defective items, a sample of 4 items are drawn at random. Let the random variable X denote the number of defective items in the sample. If the sample is drawn without replacement, find :
(a) The probability distribution of X
(b) Mean of X
(c) Variance of X
The Cartesian equation of line is : 2x - 3 = 3y + 1 = 5 - 6z. Find the vector equation of a line passing through (7, – 5, 0) and parallel to the given line.
Water is dripping out from a conial funnel of semi-verticle angle at the uniform rate of 2 cm2/sec in the surface, through a tiny hole at the vertex of the bottom. When the slant height of the water level is 4 cm, find the rate of decrease of the slant height of the water.
Let r be the radius, h be the height and V be the volume of the funnel at any time t.
V = ...(i)
Let I be the slant height of the funnel
Given, Semi-vertical angle = 45° in the triangle ADE
And,
Thus, ...(ii)
Putting these values in equation(i),
V =
V =
V = ...(iii)
differentiate w. r. t. t,
...(iv)
Since it is given that rate of change (decrease) of volume of water w.r.t. t is
Therefore,
Thus, the rate of decrease of the slant height of the water is .
Using matrices, solve the following system of equations :
2x - 3y + 5z = 11
3x + 2y - 4z = - 5
x + y - 2z = - 3
A cone is inscribed in a sphere of radius 12 cm. If the volume of the cone is maximum, find its height.