In a box of 10 electrical parts, 2 are defective.(a)If you choose one part at r

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问题 In a box of 10 electrical parts, 2 are defective.
(a)If you choose one part at random from the box, what is the probability that it is not defective?
(b)If you choose two parts at random from the box, without replacement, what is the probability that both are defective? [br]

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答案 4/5

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In a box of 10 electrical parts, 2 are defective.(a)If you choose one part at r

Terryishavinglunchatasaladbar.Therearetwotypesoflettucetochoosef

Whatistheareaoftheshadedfigure?[img]2011q3/ct_egmatqj_egmatqchoose_0056_2

If[img]2011q3/ct_egmatqm_egmatqchoose_0468_201121[/img]andxy=4,then7y+2x=[i

[img]2011q3/ct_egmatqm_egmatqchoose_0444_201121[/img]A、0.0125B、0.025C、0.1D、0.

[img]2011q3/ct_egmatqm_egmatqchoose_0443_201121[/img]A、 B、 C、

Whatistheperimeterofasquarewitharea[img]2011q3/ct_egmatqm_egmatqchoose_0

[img]2011q3/ct_egmatqm_egmatqchoose_0182_201121[/img]A、[img]2011q3/ct_egmatqm_eg

[img]2011q3/ct_egmatqm_egmatqchoose_0280_20112[/img]Anewspaperpolled1,000

[img]2011q3/ct_egmatqm_egmatqchoose_0104_201121[/img]A、 B、 C、

If8a=9bandab≠0,whatistheratioof[img]2011q3/ct_egmatqm_egmatqchoose_0098

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施工企业甲与砖厂乙签订了透水砖的采购合同，数量10万块，总价款5万元。后来，砖厂