Show that the rectangle of maximum perimeter which can be inscribed in a circle o radius 10 cm is a square of side 10 cm.
AB = 2x; BC = 2y
x2 + y2 = (10)2
4x2 + 4y2 = 400
P = 4x + 4y
= 4x + 4.
gives us,
= < 0
Hence perimeter is maximum when x =
ABCD is square of side cm.
Hence proved.
Box I contains two white and three black balls. Box II contains four white and one black balls and box III contains three white and four black balls. A dice having three red, two yellow, and one green face, is thrown to select the box. If red face turns up, we pick up box I, if yellow face turns up, we pick up box II, otherwise we pick up box III. Then, we draw a ball from the selected box. If the ball drawn is white, what is the probability that the dice had turned up with a red face?
Five dice are thrown simulteneously. If the occurence of an odd number in a single dice is considered a success, find the probability of maximum three successses.