Datrys 20!/15!5!15!/11!4!

$$\frac{ 20 ! }{ 15 ! 5 ! } \frac{ 15 ! }{ 11 ! 4 ! }$$

Enrhifo

$$21162960$$

Camau Ateb

Ffactorial 20 yw 2432902008176640000.

$$\frac{2432902008176640000}{15!\times 5!}\times \frac{15!}{11!\times 4!}$$

Ffactorial 15 yw 1307674368000.

$$\frac{2432902008176640000}{1307674368000\times 5!}\times \frac{15!}{11!\times 4!}$$

Ffactorial 5 yw 120.

$$\frac{2432902008176640000}{1307674368000\times 120}\times \frac{15!}{11!\times 4!}$$

Lluosi 1307674368000 a 120 i gael 156920924160000.

$$\frac{2432902008176640000}{156920924160000}\times \frac{15!}{11!\times 4!}$$

Rhannu 2432902008176640000 â 156920924160000 i gael 15504.

$$15504\times \frac{15!}{11!\times 4!}$$

Ffactorial 15 yw 1307674368000.

$$15504\times \frac{1307674368000}{11!\times 4!}$$

Ffactorial 11 yw 39916800.

$$15504\times \frac{1307674368000}{39916800\times 4!}$$

Ffactorial 4 yw 24.

$$15504\times \frac{1307674368000}{39916800\times 24}$$

Lluosi 39916800 a 24 i gael 958003200.

$$15504\times \frac{1307674368000}{958003200}$$

Rhannu 1307674368000 â 958003200 i gael 1365.

$$15504\times 1365$$

Lluosi 15504 a 1365 i gael 21162960.

$$21162960$$

Ffactor

$$2^{4}\times 3^{2}\times 5\times 7\times 13\times 17\times 19$$