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प्रश्न
Four children are running a race:
In how many different ways could they finish the race?
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उत्तर
The first and second places can be filled in 12 ways
The third-place can be filled (from the remaining 2 children) in 2 ways and the fourth place can be filled in 1 way
So the race can be finished in 12 × 2 × 1 = 24 ways
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