probability formulas

Let us learn about probability formulas

-->There are seven pens in a box.2 are black color pen.3 are blue color pen.2 are red color pen. What is the probability that a black pen will be picked? Number of ways is occurs: 2(there are 2 black color pen)
Total number of outcomes: 7(there are 7 pens in total)
So the probability is 2/7=0.28

Probability formulas

P(A) = The Number Of Ways Event “A” Can Occur

The total number Of Possible Outcomes