Unable to draw the number of basic events in rats: c (7,44) = 38320568.
The probability of not catching mice is c (7,44)/c (7,49) = 0.446.
The probability of catching the mouse is: 1-0.446=0.554.
Other zodiac signs, such as cattle: the probability of not being drawn is c (7,45)/c (749) = 0.528.
The probability of drawing cows is: 1-0.528=0.472.