4. The California Department of Public Health collects data on covid cases and age demographics. Say that there are about 100 covid cases amongst the 7.5 million people aged 18-34. Then how many ways are there for the 100 reported covid cases to be present among the 7.5 million people aged 18-34? 5. In the computer game called DotA, let letters A and B represent the following events: A = someone plays the character Lion B = someone uses the item called Blink Dagger (it increases mobility) This is the Venn Diagram: A B

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a) What percent of players do not use blink dagger and do not play Lion? b) Are events A and B independent, disjoint, both, or neither?