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nikdorinn [45]
3 years ago
6

How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?

Mathematics
2 answers:
inysia [295]3 years ago
7 0
60 ways because the easy way to solve this problem is identify the numbers being used and than multiply them by each other.
boyakko [2]3 years ago
3 0
Slot method 20 options 3 slots First slot: 20 options Second slot: 19 options (one used up for 1st slot) Third slot: 18 (one less than last) Multiply them 20 times 19 times 18=6840 Answer is 6840 ways
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Answer:

$9.50h, $(9.50h +2.20rh)

Step-by-step explanation:

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= $9.50h

If he fixes a watch per hour, additional income= $2.20h

If he fixes r watches per hour, additional income= $2.20rh

Total income

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