Ukuba ubufuna ukuthi "iimvume", emva koko ubuza umbuzo "zingaphi iindlela ezahlukeneyo endinokuzicwangcisa ngokulandelelana kwamanani amane?" Impendulo yalo mbuzo (oyifumene ngokulungileyo) yile 24.
Ngokufanayo, Zeziphi zonke iindibaniselwano ezinokubakho ze-ABCD? Lulonke ulungiselelo olunokwenzeka loonobumba abcd ngu 24.
Mangaphi amanani ama-4 akhoyo? AMANE – AMANANI AMANANI ngamanani anemivo emine, okt aneendawo, amashumi, amakhulu kunye namawaka. Enyanisweni, ukufumana inani lamanani phakathi kwawo nawaphi na amanani amabini anikiweyo, sisebenzisa ifomula efanayo. Ngoko ke, kukho 9000 amanani anemivo emine kuzo zonke.
Zingaphi iindibaniselwano ezikhoyo kunye namanani ama-4 kunye nonobumba? Njengoko zonke iindibaniselwano zinokwenzeka, indawo nganye ye-4 ingaba nokukhetha kwe-26, ngoko kuya kuba yi-26*26*26*26 = Ukudityaniswa okunokwenzeka okungama-456,976 lwamagama.
Okwesibini Zingaphi iindlela zokucwangciswa koonobumba aba-4? Impendulo ngu-4! = 24. Isithuba sokuqala sinokuzaliswa nguye nawuphi na kwabane oonobumba.
Mingaphi indibaniselwano yemibala emi-4 ekhoyo?
Kuba nayiphi na indibaniselwano yale mibala ifuneka, ukuba sinokudibanisa nayiphi na imibala emi-2 okanye ngaphezulu, singafumana indibaniselwano eyimpumelelo. Ngoko ke, ukudityaniswa okunokwenzeka kwayo nayiphi na imibala emine eyahlukeneyo iya kuba ngu-6+4+1 = 11.
Zeziphi ezona digit 4 inkulu kunye neyona incinci? Awona manani makhulu nawona mancinci anemivo emi-4 1000 and 9999 ngokulandelelana.
Leliphi elona nani linamanani ama-4? Elona nani liphezulu leenombolo ezine
So 9999 lelona nani linamanani amane kwinkqubo yamanani. Kungoko kungqinwa ukuba u-9999 lelona nani linamanani amane likhulu.
Mangaphi amanani anemivo emi-4 akhoyo anemivo eyahlukileyo?
Ngoko ke ngokomgaqo wokubala osisiseko, inani lamanani anemivo emi-4 ngu-9.9. 8.7= 4536. Ke ngoko, kukho 4536 amanani anemivo emine anamanani ahlukileyo.
Yintoni igama lokugqithisa lamagama ama-4? Igama lokugqitha elinabalinganiswa abane liqulathe kanobumba omnye wealfabhethi kunye nemivo emithathu eyahlukileyo phakathi kuka-0 no-9, equkiwe. Unobumba kufuneka avele njengonobumba wesibini okanye wesithathu wegama eliyimfihlo.
Ubala njani imidibaniso?
Khumbula ukuba indibaniselwano yindlela yokubala iziphumo zizonke zesiganeko apho ulandelelwano lweziphumo lungabalulekanga. Ukubala iindibaniselwano, siya kusebenzisa i ifomula nCr = n! / r! * (n-r)!, apho u-n emele inani lezinto, kwaye u-r umele inani lezinto ezikhethiweyo ngexesha.
Zingaphi iindibaniselwano ezinoonobumba aba-4 kunye namanani ama-2?
Ubala njani inani leendibaniselwano?
Khumbula, ifomula yokubala indibaniselwano NCr = n! / r! * (n – r)!, apho u-n emele inani lezinto, kwaye u-r umele inani lezinto ezikhethiweyo ngexesha.
Mangaphi amalungiselelo awohlukeneyo oonobumba aba-4 abanokwakheka ukuba unobumba wokuqala kufuneka abe ngu-w okanye u-k?
Kungoko inani lilonke leendlela zokwenza iikhowudi zokufowuna ezibandakanya oonobumba aba-4, ukuqala ngo-K okanye ku-W ngaphandle kophinda-phindo lwabanye oonobumba. 2(25)(24)(23). Kukho ukhetho olu-2 lweleta yoku-1 (K okanye W).
Ubala njani inani leendlela ezinokuthi zilungelelaniswe ngayo? Ngokubhekiselele ngokubanzi, ukuba sinezinto ze-n zizonke kwaye sifuna ukukhetha u-k ngokolandelelwano oluthile, sifumana: n! /(n–k)! Kwaye le yifomula yokuvumela: Inani leendlela k izinto ezinokuodolwa kwizinto eziyi-n: P(n,k) = n! /(n–k)!
Zingaphi iindibaniselwano zoonobumba aba-4 abakhoyo? Ukuba ndiyawuqonda umbuzo wakho, impendulo ithi 26^4 (26 x 26 x 26 x 26), okanye Ukudityaniswa okungama-456,976.
Mangaphi amaqela esi-2 anokwenziwa ngabantu aba-4?
Kungenjalo, oku kuyafana. Abantu aba-2 kufuneka bakhethwe kwaba-4 ukwenza iqela, kodwa uqwalaselo ngalunye luya kubonakala kabini njengoko elinye lamaqela mabini linokukhethwa. Kukho C(4, 2) = 6 iindlela onokuthi ukhethe ngazo abantu bokuqala kula maqela mabini.
Leliphi elona nani likhulu linamanani ama-4 usebenzisa amanani ahlukeneyo? Elona nani likhulu linamanani amane, usebenzisa idijithi enye kuphela ngama-9,999 (i-9,999 lelona nani likhulu linamanani amane). Elona nani linamanani amane, usebenzisa amanani amabini ahlukeneyo ngama-9,998. Elona nani likhulu linamanani amane, kusetyenziswa zonke iidijiti ezahlukeneyo 9,876.
Ngowuphi umahluko phakathi kwenani elikhulu elinamanani ama-4?
Elona nani linamanani ama-4 yi-9,999. Umahluko phakathi kwala manani uyakuba =1,00,000 - 9,999 = 90,001.
Leliphi elona nani linamanani ama-4 elisisikwere esigqibeleleyo? Ngoko ke sinokuthi isikwere sika-99 linani elinika elona nani liphezulu linamanani amane. Kwaye ke ngoko 9801 lelona nani likhulu elinamanani asisikwere esigqibeleleyo.
Yeyiphi eyona PIN inzima inamanani ama-4?
Phantse i-11% ye-3.4 yezigidi ze-passwords ziyi-1234. Yiloo 374,000! Ifunyenwe rhoqo kuneyona khowudi iphantsi ye-4,200 idibene. I-PIN yesibini ethandwa kakhulu enamanani-4 yi-1111 phantse i-6% (204,000).
...
Yile nto abayifumeneyo.
Uhlu | IPIN | Freq |
---|---|---|
#1 | 1234 | 10.713% |
#2 | 1111 | 6.016% |
#3 | 0000 | 1.881% |
#4 | 1212 | 1.197% |
Yintoni ikhowudi enamanani ama-4? Ukuba ikhompyuter iqikelela amanani ngokungakhethiyo, ke yonke indibaniselwano enye ayinakwenzeka ukuba iqikelele. Ukuba iqikelela ngokusekwe kutyekelo lwendalo lwabantu kwipateni, eyona nto inzima ukuyithelekelela kukuba “8068 ". Ngesizathu esithile, xa uphononongo lwenziwa le yayiyeyona isetyenziswa kancinane indibaniselwano enamanani ama-4 ngelo xesha.
Ngawaphi amathuba okuqikelela inani elinamanani ama-4?
Ilula kakhulu. Kwidesimali emi-4 kukho i-10,000 (0000 ukuya ku-9999) amanani anokwenzeka. Amathuba okuba nayiphi na enye yazo ivele ngokungacwangciswanga enye ngo-10,000.