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In a code the first letter can be chosen in (4) ways and the second digit in (6) ways. How many codes can be formed?

Answer and explanation

Correct answer: 24

There are 4 choices for the first position. For each of these choices, there are 6 choices for the second position; hence, by the fundamental principle of counting, the total number of codes is \(4\times6=24\). Option 10 comes from adding the choices, which is incorrect because every letter can be paired with every digit. Exam tip: multiply the numbers of choices for successive independent selections.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsCode FormationMultiplication PrincipleClass 11 MathematicsMathematicsClass 11 Mcq

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