# math

An electronics store receives a shipment of 20 graphing calculators, including 3 that are defective. Four of the calculators are selected to be sent to a local high school. A. How many selection can be made using the originial shipment?

1. 👍 0
2. 👎 0
3. 👁 2,892
1. If the only distinction between calculators is the defects then there are 4 possible selections, namely
0, 1, 2, 3 defective calculators along with good ones for the balance.

If the calculators bear serial numbers, i.e. they are considered distinct, then there are (20,4)=20!/(4!16!)=4845 selections.

1. 👍 3
2. 👎 2
2. An electronics store receives a shipment of 20 graphing calculators, including 2 that are defective. Four of the calculators are selected to be sent to a local high school. A. How many selection can be made using the originial shipment?

1. 👍 0
2. 👎 0
3. An electronics store receives a shipment of 20 graphing​ calculators, including 4 that are defective. Four of the calculators are selected to be sent to a local high school. How many of these selections will contain no defective​ calculators?

1. 👍 0
2. 👎 2

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