1. Which of the following is an arithmetic function that calculates the total number of positive integers less than or equal to some number n, that are relatively prime to n.

a) Euler’s phi function

b) Euler’s omega function

c) Cauchy’s totient function

d) Legrange’s function

2. Let A={1,2,3} B={2,3,4} C={1,3,5} D={2,3}. Find the cardinality of sum of all the sets.

a) 6

b) 5

c) 4

d) 7

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