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A computer lab has 4 rows of computers and 9 computers in each row. In how many ways can one computer be chosen?

Answer and explanation

Correct answer: 36 ways

This is a direct application of the fundamental principle of counting. To identify one computer, first select its row and then select its position within that row. There are 4 choices for the row. For every selected row, there are 9 choices for the computer, so the total number of row-position pairs is 4 × 9 = 36. Hence option A is correct. The answer 13 in option B comes from adding the two numbers, but addition would not count paired choices. Option C is only twice the number of rows, and option D is the sum of 4 and 9 multiplied by ? no valid counting rule; it is simply an incorrect distractor. Each computer corresponds to one unique row and position.

Related tags

Fundamental-Principle-Of-CountingMultiplication-RuleSchool-MathematicsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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