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The big-O notation for f(x) = 5logx is?

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The big-O notation for f(x) = 5logx is?

(a) 1

(b) x

(c) x^2

(d) x^3

This question was addressed to me in final exam.

My question is from The Growth of Functions in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

1 Answer

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Best answer
Correct choice is (b) x

Explanation: logx < x, it follows that 5logx < x.

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