Which of the following numbers is irrational? -0.3 the square root of 3 1/3 0.13 repeated

The square root of 3 is irrational, because it doesn't have a pattern.

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if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads