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A 4-digit number is formed using distinct digits from 0, 1, 2, 3, 4, 5, and 6. Its first digit cannot be 0, and its last digit must be odd. How many such numbers are possible?

Answer and explanation

Correct answer: 300 numbers

The last digit has 3 choices: 1, 3, or 5. After choosing it, the first digit has 5 nonzero choices among the remaining digits. The middle places then have 5 and 4 choices. Thus, the total is 3 × 5 × 5 × 4 = 300 numbers.

Related tags

Counting PrinciplePermutations And CombinationsClass 11Fundamental Principle Of CountingMathematicsClass 11 Mcq

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