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

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

What is the probability of a disc thrown on a chess-board, coming to rest on i] a white square? ii a black square on the border ?

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

In an entrance test that is graded of the basis of two examination, the probability of a randomly chosen student passing the first examination is 0.8 and the probability of passing the second examination is 0.7. The probability of passing atleast one of them is 0.95. What is the probability of passing both?

If 4-digit numbers greater than 5,000 are randomly formed from the digits 0,1, 3, 5, and 7, what is the probability of forming a number divided by 5 when, (i) the digits are repeated? (ii) the repeition of digits is not allowed?

In fig., sectors of two concentric circles of radii 7 cm and 3.5 cm are given. Find the area of shaded region. ("Use " pi = (22)/(7))

A thin wire is in the shape of a circle of radius 77 cm. It is bent into a square. Find the side of the square (Taking , pi = (22)/(7) )

In a school, there are 1000 students, out of which 430 are girls. It is known that out of 430, 10% of the girls study in class XII. What is the probability that a student chosen randomly studies in Class XII given that the chosen student is a girl?

In fig., APB and AQP are semi-circles, and AO = OB if the perimeter of the figure is 47 cm, find the area of the shaded region (use pi = (22)/(7) )