All red face cards are removed from a pack of playing cards. The remaining cards are well shuffled and then a card is drawn at random from them. Find the probability that the drawn card is a red card.

Two customers are visiting a particular shop in the same week (Monday to Saturday). Each is equally likely to visit the shop on any one day as on another. What is the probability that both will visit the shop on the same day?

Suppose you drop a tie at random on the rectangular region shown in the figure. What is the probability that it will land inside the circle with diameter $1 \mathrm{m}$? 

In the accompanying diagram, a fair spinner is placed at the centre $\mathrm{O}$ of the circle. Diameter $\mathrm{A}\mathrm{O}\mathrm{B}$ and radius $\mathrm{O}\mathrm{C}$ divide the circle into three regions labelled $\mathrm{X},\mathrm{}\mathrm{Y}$ and $\mathrm{Z}.$ If $\mathrm{\angle }\mathrm{B}\mathrm{O}\mathrm{C}=45°$. What is the probability that the spinner will land in the region $\mathrm{X}?$

A target shown in the figure consists of three concentric circles of radii $3 \mathrm{cm}, 7 \mathrm{cm}$ and $9 \mathrm{c}\mathrm{m}$ respectively. A dart is thrown and land on the target. What is the probability that the dart will land on the shaded region?