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In a painting (3) background colors (4) border colors and (2) signature colors are chosen. How many painting forms are possible?

Answer and explanation

Correct answer: (24) forms

The direct answer is option A: 24 forms. A painting is determined by three separate selections: one background color, one border color, and one signature color. There are 3 choices for the background, 4 for the border, and 2 for the signature. Therefore, by the multiplication principle, the total number is \(3\times4\times2=24\). Option A is correct because each background can be combined with every border and every signature color. Option B, 9, comes from an unsuitable addition and does not count all combinations. Option C, 12, omits one factor or counts only part of the choices. Option D, 48, is twice the correct total and would require an extra independent choice that the question does not provide. The colors are treated as choices for different roles; even if the same color name could appear in more than one role, each role is still selected from its stated list. The memory rule is simple: separate required selections made together are multiplied.

Related tags

Permutations-Combinations Fundamental-Principle-Counting Class11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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