Question: 2. Asymptotic Notation (8 points) Show the following using the definitions of O, , and . (1) (2 points) 2n 3 + n 2 +

2. Asymptotic Notation (8 points)

Show the following using the definitions of O, , and .

(1) (2 points) 2n 3 + n 2 + 4 (n 3 )

(2) (2 points) 3n 4 9n 2 + 4n (n 4 ) (Hint: careful with the negative number)

(3) (4 points) Suppose f(n) O(g1(n)) and f(n) O(g2(n)).

Which of the following are true? Justify your answers using the definition of O. Give a counter example if it is false.

(a) f(n) O( 5 g1(n) + 100 )

(b) f(n) O( g1(n) + g2(n) )

(c) f(n) O( g1(n) g2(n) )

(d) f(n) O( max(g1(n), g2(n)) )

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