An electronics store receives a shipment of 20 graphing calculators , including 7 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 ?

1/800 is the right answer

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.