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A (4)-digit number is formed from (1,2,3,4,5,6,7,8). Exactly (1) digit must be from (1,2,3) and the remaining (3) digits from (4,5,6,7,8). No repetition is allowed. How many numbers are possible?

Answer and explanation

Correct answer: (4 \times 3 \times 5 \times 4 \times 3=720)

First choose the position of the digit from the special group in (4) ways, then fill (3) and (5,4,3) choices. For exactly-one conditions, position choice is essential.

Related tags

CountingDigitsExact-OneFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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