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A website signup has (3) profile photo options and (6) username style options. In how many ways can one profile be made?

Answer and explanation

Correct answer: (18)

The direct answer is C: 18 profiles. A profile requires one photo choice and one username-style choice. For every one of the 3 photo options, any of the 6 username styles can be selected. Therefore the independent choices are multiplied: \(3\times6=18\). Option A, 9, incorrectly adds 3 and 6; addition is for alternatives where only one group is chosen. Option B, 12, has no valid counting rule here and undercounts the combinations. Option C is correct because it includes every photo-style pairing. Option D, 36, is too large and would count extra choices not present in the question. The reliable method is to list the stages: first choose a photo, then choose a username style, and multiply the numbers of possibilities.

Related tags

Permutations And CombinationsCounting PrincipleMultiplication Rule

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