Mathematics, 27.01.2021 20:10 slaybyely

Brian has 2 parents, 4 grandparents, 8 great-grandparents, and so on. a. Write an explicit formula for the number of
ancestors Brian has in a generation if
he goes back to the nth generation.

b. Write a recursive formula for the number of
ancestors Brian has in a generation if
he goes back to the nth generation.

(PLEASE EXPLAIN WHY)

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