A bag contains 6\displaystyle {6} green\displaystyle {g}{r}{e}{e}{n} marbles, 3\displaystyle {3} red\displaystyle {r}{e}{d} marbles, 10\displaystyle {10} black\displaystyle {b}{l}{a}{c}{k} marbles. If one marble is drawn from the bag then replaced, what is the probability of drawing a green\displaystyle {g}{r}{e}{e}{n} marble then a black\displaystyle {b}{l}{a}{c}{k} marble?
 

In a number guessing game. You ask a person to guess a number from one 1 to 10. If the person makes a random guess, what is the probability their guess will be less than 7\displaystyle {7}?
 

A bag contains 3\displaystyle {3} blue\displaystyle {b}{l}{u}{e} marbles, 10\displaystyle {10} black\displaystyle {b}{l}{a}{c}{k} marbles, 6\displaystyle {6} red\displaystyle {r}{e}{d} marbles. If one marble is drawn from the bag but not replaced, what is the probability of drawing a blue\displaystyle {b}{l}{u}{e} marble then a red\displaystyle {r}{e}{d} marble?