18 more than the product of 4 and a number z is -54.
2 answers:
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<h2>Answer:</h2>
The total number of ways can first, second and third place can be assigned are:
6840
<h2>Step-by-step explanation:</h2>The total number of people that compete are: 20
Out of these 20 people we have to chose 3 people and also arrange them according to their ranks.
We know that when we have to choose and arrange r items out of total n items then we need to use the method of permutation.
Hence, the formula is given by:
Here we have:
n=20 and r=3
Hence, the number of ways first, second and third place can be assigned are:
Hence, the answer is:
6840