Find the probability of the dart hitting the board in the circular region B (i.e. ring B).

Without calculating, write the percentage of probability of the dart hitting the board in circular region C (i.e. ring C).

Assume that a dart will hit the dart board and each point on the dart board is equally likely to be hit in all the three concentric circles where radii of concetric circles are 3 cm, 2 cm and 1 cm as shown in the figure below. Find the probability of a dart hitting the board in the region A. (The outer ring)

What is the probability that a randomly thrown dart hits the square board in shaded region (Take π = (22)/(7) and express in percentage)

(i) Find the probability of the students getting more than 40 marks. (2) Find the probability of the students getting less than 30 marks.

A magnetic field B is confined to a region rle a and points out of the paper (the z-axis), r = 0 being the centre of the circular region. A charged ring (charge Q) of radius b, b gt a and mass m lies in the xy-plane with its centre at the origin. The ring is free to rotate and is at rest. The magnetic field is brought to zero in time Deltat . Find the angular velocity omega of the ring after the field vanishes.

Three squares of chess board are selected at random. Find the probability of getting 2 squares of one colour and other of a different colour.

Three students A, B and C participate in the swimming competition. The probability that A and B win the game is same. The probability of B to win the game is twice the probability of C to win the game. Then the probability to win B or C is .......

Randomly selected one person from rural area for the following study. It is found that probability of an event that person has botanical allergy (i.e. plants allergy) is (7)/(20) & probability by sand and plant is (3)/(17) . If person has allergy by plants then find the probability that person has allergy by sand.

A bag contains five green marbles, three blue marbles, two red marbles, and two yellow marbles. One marble is drawn out randomly. a) Are the four different colour outcomes equally likely? Explain. b) Find the probability of drawing each colour marble i.e. , P(green), P(blue), P(red) and P(yellow) c) Find the sum of their probabilities.