Kubara

Kubara bifatika bigufasha kubona impanuro yumubare watanzwe hamwe nintambwe zo kubara. Injiza numero yawe hanyuma ukande kubara kugirango utangire.

Iyinjiza

Kubara

Igisubizo

Uruganda rwa 5 cyangwa 5! ni

Nigute ushobora kubara ibintu bifatika?

Kubara ibintu bifatika byumubare n cyangwa n!, Dushobora kugwiza imibare kuva 1 kugeza n kugirango tubone ukuri kwa n.

Rero, ibintu bifatika 5 cyangwa 5! irashobora kwandikwa gutya:

Imbonerahamwe

n	n!	Ibisobanuro
0	0! = 1	Uruganda rwa 0 ni 1
1	1! = 1	Uruganda rwa 1 ni 1
2	2! = 2	Uruganda rwa 2 ni 2
3	3! = 6	Uruganda rwa 3 ni 6
4	4! = 24	Uruganda rwa 4 ni 24
5	5! = 120	Uruganda rwa 5 ni 120
6	6! = 720	Uruganda rwa 6 ni 720
7	7! = 5040	Uruganda rwa 7 ni 5040
8	8! = 40320	Uruganda rwa 8 ni 40320
9	9! = 362880	Uruganda rwa 9 ni 362880
10	10! = 3628800	Uruganda rwa 10 ni 3628800
11	11! = 39916800	Uruganda rwa 11 ni 39916800
12	12! = 479001600	Uruganda rwa 12 ni 479001600
13	13! = 6227020800	Uruganda rwa 13 ni 6227020800
14	14! = 87178291200	Uruganda rwa 14 ni 87178291200
15	15! = 1307674368000	Uruganda rwa 15 ni 1307674368000
16	16! = 20922789888000	Uruganda rwa 16 ni 20922789888000
17	17! = 355687428096000	Uruganda rwa 17 ni 355687428096000
18	18! = 6402373705728000	Uruganda rwa 18 ni 6402373705728000
19	19! = 121645100408832000	Uruganda rwa 19 ni 121645100408832000
20	20! = 2432902008176640000	Uruganda rwa 20 ni 2432902008176640000

Ni iki gifatika?

Ibikorwa nibicuruzwa byose byuzuye bitarenze cyangwa bingana na n, byerekanwe na n! aho n numubare utari mubi. Ibintu bya n nabyo bingana nibicuruzwa bya n hamwe nibindi bito bito. Kurugero, nibyo kuko 5! = 5 × 4! = 5 × 4 × 3 × 2 × 1, Agaciro ka 0! ni 1, ukurikije amasezerano kubicuruzwa byubusa (kuva Wikipedia).