simple probability
the letters that spell mathematics are placed in a bag what is the probability of getting a vowel from the bag
4/11
x/5 - 13 = 20
x=165
the numbers 1-11 are placed in a bag what is the probability of getting an even number
5/11
inverse or opposite of multiplication
division
a six sided cube is rolled. what is the probability of rolling a 6
1/6
inverse or opposite of division
multiplication
a drawer has 3 red shirts, 2 blue shirts, and 4 white shirts. what is the probability of choosing a red or white shirt.
5/9
inverse or opposite or addition
abstraction
what is the probability of choosing a spade out of a standard deck of cards
1/4
inverse or opposite of subtraction
addition