First class

The shipment contains 40 items. 36 are first grade, 4 are defective. How many ways can select 5 items, so that it is no more than one defective?

Correct answer:

n =  612612

Step-by-step explanation:

C5(36)=(536)=5!(365)!36!=543213635343332=376992  n1=(536)=376992 C4(36)=(436)=4!(364)!36!=432136353433=58905  n2=4 (436)=4 58905=235620 n=n1+n2=376992+235620=612612



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