210 (tiro)

210 waa tiro dabiici ah (natural number) oo raacda 209 kana horreysa 211. Waa tiro toban-labaad (isku-dhafan, ma aha tiro-asal), maxaa yeelay waxay leedahay qaybiyeyaal ka badan 1 iyo naftooda.

Qaybinta asaliga ah ee 210 waa 2 × 3 × 5 × 7. Taasi waa isku-dhufashada afarta tiro-asal ee ugu horreeya, sidaas darteed 210 waxaa loo yaqaan "primorial" (tiro-asal-dhufan) ee 7, oo badanaa loo qoro 7#.

Sifooyinka xisaabeed

210 waa tiro saddex-xagal ah (triangular number): waa wadarta tirooyinka 1 ilaa 20, taas oo ah 20 × 21 ÷ 2 = 210. Sidoo kale waa tiro afar-cabbir ah oo simplex ah, oo la mid ah xulashada 4 shay oo laga soo qaatay 10 shay: C(10,4) = 210.

Maadaama qaybinteedu tahay afar tiro-asal oo kala duwan oo mid walbana hal jeer soo noqonayo, 210 waxay leedahay 16 qaybiye oo dhammaystiran: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105 iyo 210. Wadarta qaybiyeyaasheeda saxda ah (kuwa ka yar 210) way ka badan tahay 210, sidaas awgeed waa tiro "barwaaqo" ah (abundant number).

210 waa tirada ugu yar ee lagu qaybin karo dhammaan tirooyinka 1 ilaa 7 marka laga reebo 4; sidoo kale waa kan ugu yar ee wadarta gaar ah ee afarta tiro-asal ee ugu horreeya. Waxay kaloo ah tiro ku dhammaanaysa eber, sidaas darteed waxay u qaybsantaa 10.

Isticmaal kale

Tirooyinka noocan oo kale ah waxaa lagu isticmaalaa cilmiga tirooyinka, gaar ahaan raadinta tirooyinka asalka ah, maxaa yeelay tirooyinka primorial-ka ku salaysan waxay caawiyaan shaandhaynta (sieve) tirooyinka. 210 waxay kaloo u muuqataa magac dhinacyo kale ah — tusaale ahaan lambar wadooyin, sannado taariikheed, ama lambaro telefoon aag ah — laakiin kuwaas isticmaalkoodu waa mid ka duwan macnaha xisaabeed.